diff --git a/apis_ontology/filtersets.py b/apis_ontology/filtersets.py
index 75288c8..6553921 100644
--- a/apis_ontology/filtersets.py
+++ b/apis_ontology/filtersets.py
@@ -103,29 +103,37 @@ def fuzzy_search_unaccent_trigram(queryset, fields, value):
     return trigram_search_filter(queryset, fields, tokens)
 
 
-class GenericSearchFilterSet(AbstractEntityFilterSet):
+class BaseEntityFilterSet(AbstractEntityFilterSet):
+    """
+    Parent class for all entity model classes.
+    """
+
+    class Meta(AbstractEntityFilterSet.Meta):
+        filter_overrides = {
+            **AbstractEntityFilterSet.Meta.filter_overrides,
+            ArrayField: {
+                "filter_class": django_filters.MultipleChoiceFilter,
+                # "extra" attribute not working for fields with choices, see:
+                # https://github.com/carltongibson/django-filter/issues/1475
+                "extra": lambda f: {
+                    "lookup_expr": "icontains",
+                    "widget": forms.SelectMultiple,
+                },
+            },
+        }
+
     def __init__(self, *args, **kwargs):
         super().__init__(*args, **kwargs)
-        if "search" in self.filters:
-            self.filters.move_to_end("search", False)
+        if "custom_search" in self.filters:
+            self.filters.move_to_end("custom_search", False)
 
 
-class PersonNameMixinFilterSet(GenericSearchFilterSet):
-    search = django_filters.CharFilter(
-        field_name=[
-            "surname",
-            "forename",
-            "fallback_name",
-            "alternative_name",
-        ],
-        help_text=_("Suche in allen Namensfeldern"),
-        label=_("Suche: Namen"),
-        method=fuzzy_search_unaccent_trigram,
-    )
-
+class TitlesSearch(django_filters.FilterSet):
+    """
+    Search within title and subtitle fields.
+    """
 
-class TitlesMixinFilterSet(GenericSearchFilterSet):
-    search = django_filters.CharFilter(
+    custom_search = django_filters.CharFilter(
         field_name=[
             "title",
             "subtitle",
@@ -136,8 +144,16 @@ class TitlesMixinFilterSet(GenericSearchFilterSet):
     )
 
 
-class AlternativeNameMixinFilterSet(GenericSearchFilterSet):
-    search = django_filters.CharFilter(
+class AlternativeNameSearch(django_filters.FilterSet):
+    """
+    Search within name and alternative_name fields.
+
+    With the exception of person-like entities (whose names are more complex),
+    the existence of the latter is assumed to be predicated on the former,
+    i.e. an entity cannot have an "alternative_name" without a "name".
+    """
+
+    custom_search = django_filters.CharFilter(
         field_name=[
             "name",
             "alternative_name",
@@ -148,39 +164,47 @@ class AlternativeNameMixinFilterSet(GenericSearchFilterSet):
     )
 
 
-class PersonFilterSet(PersonNameMixinFilterSet):
+class PersonSearch(django_filters.FilterSet):
+    """
+    Search within the various name fields used for persons and person-like
+    entities (like characters).
+    """
+
+    custom_search = django_filters.CharFilter(
+        field_name=[
+            "surname",
+            "forename",
+            "fallback_name",
+            "alternative_name",
+        ],
+        help_text=_("Suche in allen Namensfeldern"),
+        label=_("Suche: Namen"),
+        method=fuzzy_search_unaccent_trigram,
+    )
+
+
+class PersonFilterSet(BaseEntityFilterSet, PersonSearch):
     pass
 
 
-class CharacterFilterSet(PersonNameMixinFilterSet):
+class CharacterFilterSet(BaseEntityFilterSet, PersonSearch):
     new_fictionality = django_filters.MultipleChoiceFilter(
         choices=Character.CharacterFictionality.choices,
         lookup_expr="icontains",
     )
 
-    class Meta(PersonNameMixinFilterSet.Meta):
+    class Meta(BaseEntityFilterSet.Meta):
         fields = {
             "new_fictionality": ["icontains"],
         }
-        filter_overrides = {
-            ArrayField: {
-                "filter_class": django_filters.MultipleChoiceFilter,
-                # "extra" attribute not working for fields with choices, see:
-                # https://github.com/carltongibson/django-filter/issues/1475
-                "extra": lambda f: {
-                    "lookup_expr": "icontains",
-                    "widget": forms.SelectMultiple,
-                },
-            },
-        }
 
 
 class VersionCharacterFilterSet(CharacterFilterSet):
     pass
 
 
-class WorkFilterSet(TitlesMixinFilterSet):
-    search = django_filters.CharFilter(
+class WorkFilterSet(BaseEntityFilterSet, TitlesSearch):
+    custom_search = django_filters.CharFilter(
         field_name=[
             "title",
             "subtitle",
@@ -237,28 +261,17 @@ class WorkFilterSet(TitlesMixinFilterSet):
         lookup_expr="icontains",
     )
 
-    class Meta(TitlesMixinFilterSet.Meta):
+    class Meta(BaseEntityFilterSet.Meta):
         fields = {
             "temporal_order": ["icontains"],
         }
-        filter_overrides = {
-            ArrayField: {
-                "filter_class": django_filters.MultipleChoiceFilter,
-                # "extra" attribute not working for fields with choices, see:
-                # https://github.com/carltongibson/django-filter/issues/1475
-                "extra": lambda f: {
-                    "lookup_expr": "icontains",
-                    "widget": forms.SelectMultiple,
-                },
-            },
-        }
 
 
 class VersionWorkFilterSet(WorkFilterSet):
     pass
 
 
-class ExpressionFilterSet(TitlesMixinFilterSet):
+class ExpressionFilterSet(BaseEntityFilterSet, TitlesSearch):
     new_edition_type = django_filters.MultipleChoiceFilter(
         choices=Expression.EditionTypes.choices,
         lookup_expr="icontains",
@@ -269,45 +282,34 @@ class ExpressionFilterSet(TitlesMixinFilterSet):
         lookup_expr="icontains",
     )
 
-    class Meta(TitlesMixinFilterSet.Meta):
+    class Meta(BaseEntityFilterSet.Meta):
         fields = {
             "language": ["icontains"],
         }
-        filter_overrides = {
-            ArrayField: {
-                "filter_class": django_filters.MultipleChoiceFilter,
-                # "extra" attribute not working for fields with choices, see:
-                # https://github.com/carltongibson/django-filter/issues/1475
-                "extra": lambda f: {
-                    "lookup_expr": "icontains",
-                    "widget": forms.SelectMultiple,
-                },
-            },
-        }
 
 
 class VersionExpressionFilterSet(ExpressionFilterSet):
     pass
 
 
-class OrganisationFilterSet(AlternativeNameMixinFilterSet):
+class OrganisationFilterSet(BaseEntityFilterSet, AlternativeNameSearch):
     pass
 
 
-class PlaceFilterSet(AlternativeNameMixinFilterSet):
+class PlaceFilterSet(BaseEntityFilterSet, AlternativeNameSearch):
     pass
 
 
-class ResearchPerspectiveFilterSet(AlternativeNameMixinFilterSet):
+class ResearchPerspectiveFilterSet(BaseEntityFilterSet, AlternativeNameSearch):
     pass
 
 
-class TopicFilterSet(AlternativeNameMixinFilterSet):
+class TopicFilterSet(BaseEntityFilterSet, AlternativeNameSearch):
     pass
 
 
-class WorkTypeFilterSet(AlternativeNameMixinFilterSet):
-    search = django_filters.CharFilter(
+class WorkTypeFilterSet(BaseEntityFilterSet, AlternativeNameSearch):
+    custom_search = django_filters.CharFilter(
         field_name=[
             "name",
             "name_plural",