catnap vs short sleep

catnap and short sleep both are nouns.

Word	Noun	Adjective	Verb	Adverb
catnap	Yes	No	Yes	No
short sleep	Yes	No	No	No

As nouns, catnap and short sleep are synonyms defined as:

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

Other synonyms of catnap include forty winks, light sleep, nap, snooze.

catnap (noun)	short sleep (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)	short sleep (verb)
take a siesta