off-guard vs napping

off-guard and napping both are adjectives.

Word	Noun	Adjective	Verb	Adverb
off-guard	No	Yes	No	No
napping	No	Yes	No	No

As adjectives, off-guard and napping are synonyms defined as:

Other synonyms of off-guard include off guard, off her guard, off his guard, off one's guard, off your guard.

off-guard (adjective)	napping (adjective)
not prepared or vigilant	not prepared or vigilant