semitone vs musical interval

semitone and musical interval both are nouns.

Word	Noun	Adjective	Verb	Adverb
semitone	Yes	No	No	No
musical interval	Yes	No	No	No

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

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

Other hypernyms of semitone include interval.

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