lark about vs frolic

lark about is not a noun while frolic is a noun.

Word	Noun	Adjective	Verb	Adverb
lark about	No	No	Yes	No
frolic	Yes	No	Yes	No

As verbs, lark about and frolic are synonyms defined as:

Other synonyms of lark about include cavort, disport, frisk, gambol, lark, rollick, romp, run around, skylark, sport.

lark about (noun)	frolic (noun)
	gay or light-hearted recreational activity for diversion or amusement

lark about (verb)	frolic (verb)
play boisterously	play boisterously