run around vs skylark

run around is not a noun while skylark is a noun.

Word	Noun	Adjective	Verb	Adverb
run around	No	No	Yes	No
skylark	Yes	No	Yes	No

As verbs, run around and skylark are synonyms defined as:

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

run around (noun)	skylark (noun)
	brown-speckled European lark noted for singing while hovering at a great height

run around (verb)	skylark (verb)
play boisterously	play boisterously