dance step vs moonwalk

dance step and moonwalk both are nouns.

Word	Noun	Adjective	Verb	Adverb
dance step	Yes	No	No	No
moonwalk	Yes	No	No	No

As nouns, moonwalk is a hyponym of dance step; that is, moonwalk is a word with a more specific, narrower meaning than dance step:

dance step: a sequence of foot movements that make up a particular dance
moonwalk: a kind of dance step in which the dancer seems to be sliding on the spot

Other hyponyms of dance step include chasse, sashay, glissade.

dance step (noun)	moonwalk (noun)
a sequence of foot movements that make up a particular dance	an exploratory walk by an astronaut on the surface of the moon
	a kind of dance step in which the dancer seems to be sliding on the spot