octave vs musical octave

octave and musical octave both are nouns.

Word	Noun	Adjective	Verb	Adverb
octave	Yes	No	No	No
musical octave	Yes	No	No	No

As nouns, octave and musical octave are synonyms defined as:

octave (noun)	musical octave (noun)
a musical interval of eight tones	a musical interval of eight tones
a rhythmic group of eight lines of verse
a feast day and the seven days following it