romp vs caper

romp and caper both are nouns.

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

As nouns, romp and caper are synonyms defined as:

romp and caper: gay or light-hearted recreational activity for diversion or amusement

Other synonyms of romp include frolic, gambol, play.

romp (noun)	caper (noun)
gay or light-hearted recreational activity for diversion or amusement	gay or light-hearted recreational activity for diversion or amusement
an easy victory	a crime (especially a robbery)
a girl who behaves in a boyish manner	a ludicrous or grotesque act done for fun and amusement
	a playful leap or hop
	pickled flower buds used as a pungent relish in various dishes and sauces
	any of numerous plants of the genus Capparis