nap vs forty winks

nap and forty winks both are nouns.

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

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

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

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

nap (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)
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

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