break-dance vs dance

break-dance is not a noun while dance is a noun.

Word	Noun	Adjective	Verb	Adverb
break-dance	No	No	Yes	No
dance	Yes	No	Yes	No

As verbs, dance is a hypernym of break-dance; that is, dance is a word with a broader meaning than break-dance:

break-dance: do a break dance
dance: move in a pattern; usually to musical accompaniment; do or perform a dance

Other hypernyms of break-dance include trip the light fantastic, trip the light fantastic toe.

break-dance (noun)	dance (noun)
	taking a series of rhythmical steps (and movements) in time to music
	an artistic form of nonverbal communication
	a party for social dancing
	a party of people assembled for dancing

break-dance (verb)	dance (verb)
do a break dance	move in a pattern; usually to musical accompaniment; do or perform a dance
	move in a graceful and rhythmical way
	skip, leap, or move up and down or sideways