catnap vs forty winks

catnap and forty winks both are nouns.

Word	Noun	Adjective	Verb	Adverb
catnap	Yes	No	Yes	No
forty winks	Yes	No	No	No

As nouns, catnap and forty winks are synonyms defined as:

catnap and forty winks: sleeping for a short period of time (usually not in bed)

Other synonyms of catnap include light sleep, nap, short sleep, snooze.

catnap (noun)	forty winks (noun)
sleeping for a short period of time (usually not in bed)	sleeping for a short period of time (usually not in bed)

catnap (verb)	forty winks (verb)
take a siesta