lark about vs frisk

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

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

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

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

lark about (noun)	frisk (noun)
	the act of searching someone for concealed weapons or illegal drugs

lark about (verb)	frisk (verb)
play boisterously	search as for concealed weapons by running the hands rapidly over the clothing and through the pockets
	play boisterously