tonality vs home key

tonality and home key both are nouns.

Word	Noun	Adjective	Verb	Adverb
tonality	Yes	No	No	No
home key	Yes	No	No	No

As nouns, home key is a hyponym of tonality; that is, home key is a word with a more specific, narrower meaning than tonality:

tonality: any of 24 major or minor diatonic scales that provide the tonal framework for a piece of music
home key: the basic key in which a piece of music is written

Other hyponyms of tonality include major key, major mode, minor key, minor mode, tonic key.

tonality (noun)	home key (noun)
any of 24 major or minor diatonic scales that provide the tonal framework for a piece of music	the basic key in which a piece of music is written