diff --git a/pwgen_fr/lexique.py b/pwgen_fr/lexique.py
index 9e04dbb..c25277a 100644
--- a/pwgen_fr/lexique.py
+++ b/pwgen_fr/lexique.py
@@ -90,9 +90,11 @@ class Lexique:
         }
 
     dataset: list[Mot]
+    lemfreq: dict[str, float]
 
-    def __init__(self, dataset):
+    def __init__(self, dataset, lemfreq):
         self.dataset = dataset
+        self.lemfreq = lemfreq
 
     @classmethod
     def _ensure_uncompressed(cls):
@@ -155,6 +157,8 @@ class Lexique:
     def parse(cls) -> "Lexique":
         out = []
         rows = []
+        lemfreq: dict[str, float] = {}
+
         with cls.LEXIQUE_PATH.open("r") as h:
             reader = csv.DictReader(h, dialect="excel-tab")
             for row in reader:
@@ -188,6 +192,14 @@ class Lexique:
 
         # Second pass: populate variants
         for row in rows:
+            # Populate lemfreq
+            old_freq = lemfreq.get(row["ortho"], 0.0)
+            lemfreq[row["ortho"]] = max(
+                old_freq,
+                float(row["freqlemlivres"]),
+                float(row["freqlemfilms2"]),
+            )
+
             lemme = cls._find_word(out, row)
             if lemme is None:
                 continue
@@ -221,7 +233,7 @@ class Lexique:
                     lemme.variantes[(genre, nombre)] = row["ortho"]
 
             # No need to match adverbs (invariant)
-        return cls(out)
+        return cls(out, lemfreq)
 
     def most_common(
         self, cat_gram: CatGram, threshold: t.Optional[int] = None
diff --git a/pwgen_fr/morphalou_frequency.py b/pwgen_fr/morphalou_frequency.py
new file mode 100644
index 0000000..9633f0f
--- /dev/null
+++ b/pwgen_fr/morphalou_frequency.py
@@ -0,0 +1,74 @@
+""" Generates a worddb based on Morphalou, but limits to frequent words based on
+external sources (eg Lexique) """
+
+import logging
+import typing as t
+
+from . import lexique, morphalou
+from .word_db import Adjectif, Adverbe, Genre, Nom, Nombre, Temps, Verbe, WordDb
+
+logger = logging.getLogger(__name__)
+
+
+class MorphalouFreqSet:
+    morphalou_db: WordDb
+    lexique: lexique.Lexique
+    filtered_db: WordDb
+
+    def __init__(
+        self,
+        morphalou_db: t.Optional[WordDb] = None,
+        lexique: t.Optional[lexique.Lexique] = None,
+    ):
+        if not morphalou_db:
+            morphalou_set = morphalou.MorphalouSet()
+            morphalou_set.parse()
+            self.morphalou_db = morphalou_set.word_db
+        else:
+            self.morphalou_db = morphalou_db
+
+        if not lexique:
+            self.lexique = lexique.Lexique.parse()
+        else:
+            self.lexique = lexique
+
+        self.filtered_db = self._filter_lexique()
+
+    def _filter_nom(self, nom: Nom) -> bool:
+        freq = max(
+            self.lexique.lemfreq.get(nom.sing, 0.0),
+            self.lexique.lemfreq.get(nom.plur, 0.0),
+        )
+        return freq > 0
+
+    def _filter_adjectif(self, adjectif: Adjectif) -> bool:
+        freq = max(
+            self.lexique.lemfreq.get(adjectif.masc_sing, 0.0),
+            self.lexique.lemfreq.get(adjectif.fem_sing, 0.0),
+        )
+        return freq > 0
+
+    def _filter_verbe(self, verbe: Verbe) -> bool:
+        freq = max(
+            self.lexique.lemfreq.get(verbe.present_sing, 0.0),
+            self.lexique.lemfreq.get(verbe.futur_sing, 0.0),
+            self.lexique.lemfreq.get(verbe.imparfait_sing, 0.0),
+            self.lexique.lemfreq.get(verbe.present_plur, 0.0),
+            self.lexique.lemfreq.get(verbe.futur_plur, 0.0),
+            self.lexique.lemfreq.get(verbe.imparfait_plur, 0.0),
+        )
+        return freq > 0
+
+    def _filter_adverbe(self, adverbe: Adverbe) -> bool:
+        if " " in adverbe.adv:
+            return False
+        freq = self.lexique.lemfreq.get(adverbe.adv, 0.0)
+        return freq > 0
+
+    def _filter_lexique(self) -> WordDb:
+        out = WordDb()
+        out.noms = list(filter(self._filter_nom, self.morphalou_db.noms))
+        out.adjectifs = list(filter(self._filter_adjectif, self.morphalou_db.adjectifs))
+        out.verbes = list(filter(self._filter_verbe, self.morphalou_db.verbes))
+        out.adverbes = list(filter(self._filter_adverbe, self.morphalou_db.adverbes))
+        return out
diff --git a/pwgen_fr/word_db.py b/pwgen_fr/word_db.py
index fd4ecac..288ef5b 100644
--- a/pwgen_fr/word_db.py
+++ b/pwgen_fr/word_db.py
@@ -16,7 +16,7 @@ class Genre(Enum):
     @classmethod
     def pick(cls) -> "Genre":
         """random-pick (avoids inv)"""
-        return secrets.choice([cls.masc, cls.fem])
+        return secrets.choice([cls.MASC, cls.FEM])
 
 
 class Nombre(Enum):
@@ -141,7 +141,7 @@ class Adverbe(t.NamedTuple):
 class WordDb:
     """Base de donnée de mots, sérialisable"""
 
-    SERIALIZED_GZ_LOCATION = Path(__file__).parent.parent / "morphalou_full.json.gz"
+    SERIALIZED_GZ_LOCATION = Path(__file__).parent.parent / "morphalou.json.gz"
 
     _serialize_data: dict[str, t.Type[t.NamedTuple]] = {
         "noms": Nom,