catch a wink vs catnap

catch a wink is not a noun while catnap is a noun.

Word	Noun	Adjective	Verb	Adverb
catch a wink	No	No	Yes	No
catnap	Yes	No	Yes	No

As verbs, catch a wink and catnap are synonyms defined as:

Other synonyms of catch a wink include nap.

catch a wink (noun)	catnap (noun)
	sleeping for a short period of time (usually not in bed)

catch a wink (verb)	catnap (verb)
take a siesta	take a siesta