drowse vs nap

drowse and nap both are nouns.

Word	Noun	Adjective	Verb	Adverb
drowse	Yes	No	Yes	No
nap	Yes	No	Yes	No

As verbs, nap is a hypernym of drowse; that is, nap is a word with a broader meaning than drowse:

Other hypernyms of drowse include catch a wink, catnap.

drowse (noun)	nap (noun)
a light fitful sleep	sleeping for a short period of time (usually not in bed)
	a card game similar to whist; usually played for stakes
	the yarn (as in a rug or velvet or corduroy) that stands up from the weave
	a soft or fuzzy surface texture
	a period of time spent sleeping

drowse (verb)	nap (verb)
be on the verge of sleeping	take a siesta
sleep lightly or for a short period of time