vox vs sprechgesang

vox and sprechgesang both are nouns.

Word	Noun	Adjective	Verb	Adverb
vox	Yes	No	No	No
sprechgesang	Yes	No	No	No

As nouns, sprechgesang is a hyponym of vox; that is, sprechgesang is a word with a more specific, narrower meaning than vox:

vox: the sound made by the vibration of vocal folds modified by the resonance of the vocal tract
sprechgesang: a style of dramatic vocalization between singing and speaking

Other hyponyms of vox include singing voice, sprechstimme, voice over, voice.

vox (noun)	sprechgesang (noun)
the sound made by the vibration of vocal folds modified by the resonance of the vocal tract	a style of dramatic vocalization between singing and speaking