half step vs musical interval

half step and musical interval both are nouns.

Word	Noun	Adjective	Verb	Adverb
half step	Yes	No	No	No
musical interval	Yes	No	No	No

As nouns, musical interval is a hypernym of half step; that is, musical interval is a word with a broader meaning than half step:

half step: the musical interval between adjacent keys on a keyboard instrument
musical interval: the difference in pitch between two notes

Other hypernyms of half step include interval.

half step (noun)	musical interval (noun)
the musical interval between adjacent keys on a keyboard instrument	the difference in pitch between two notes