usance vs couvade

usance and couvade both are nouns.

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

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

usance: 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 usance include Americanism, Anglicism, Britishism, consuetude, Germanism, habit, use, hijab, rite, ritual.

usance (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
(economics) the utilization of economic goods to satisfy needs or in manufacturing
the period of time permitted by commercial usage for the payment of a bill of exchange (especially a foreign bill of exchange)