nap vs light sleep

nap and light sleep both are nouns.

Word	Noun	Adjective	Verb	Adverb
nap	Yes	No	Yes	No
light sleep	Yes	No	No	No

As nouns, nap and light sleep are synonyms defined as:

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

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

nap (noun)	light sleep (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)	light sleep (verb)
take a siesta