romp vs lark

romp and lark both are nouns.

Word	Noun	Adjective	Verb	Adverb
romp	Yes	No	Yes	No
lark	Yes	No	Yes	No

As verbs, romp and lark are synonyms defined as:

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

romp (noun)	lark (noun)
gay or light-hearted recreational activity for diversion or amusement	any carefree episode
an easy victory	any of numerous predominantly Old World birds noted for their singing
a girl who behaves in a boyish manner	a songbird that lives mainly on the ground in open country; has streaky brown plumage
	North American songbirds having a yellow breast