custom vs couvade

custom and couvade both are nouns.

Word	Noun	Adjective	Verb	Adverb
custom	Yes	Yes	No	No
couvade	Yes	No	No	No

As nouns, couvade is a hyponym of custom; that is, couvade is a word with a more specific, narrower meaning than custom:

custom: accepted or habitual practice
couvade: a custom among some peoples whereby the husband of a pregnant wife is put to bed at the time of bearing the child

Other hyponyms of custom include Americanism, Anglicism, Britishism, consuetude, Germanism, habit, use, hijab, rite, ritual.

custom (noun)	couvade (noun)
accepted or habitual practice	a custom among some peoples whereby the husband of a pregnant wife is put to bed at the time of bearing the child
habitual patronage
a specific practice of long standing
money collected under a tariff

custom (adjective)	couvade (adjective)
made according to the specifications of an individual