voice vs accompaniment

voice and accompaniment both are nouns.

Word	Noun	Adjective	Verb	Adverb
voice	Yes	No	Yes	No
accompaniment	Yes	No	No	No

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

voice: the melody carried by a particular voice or instrument in polyphonic music
accompaniment: a musical part (vocal or instrumental) that supports or provides background for other musical parts

Other hyponyms of voice include primo, secondo, voice part, backup, musical accompaniment, support, bass, bass part.

voice (noun)	accompaniment (noun)
a means or agency by which something is expressed or communicated	the act of accompanying someone or something in order to protect them
the distinctive quality or pitch or condition of a person's speech	something added to complete or embellish or make perfect
the ability to speak	a musical part (vocal or instrumental) that supports or provides background for other musical parts
the sound made by the vibration of vocal folds modified by the resonance of the vocal tract	an event or situation that happens at the same time as or in connection with another
expressing in coherent verbal form
the melody carried by a particular voice or instrument in polyphonic music
something suggestive of speech in being a medium of expression
A term used in phonetics and phonology to characterize speech sounds, with sounds described as either voiceless (unvoiced) or voiced.
a sound suggestive of a vocal utterance
an advocate who represents someone else's policy or purpose
(metonymy) a singer
(linguistics) the grammatical relation (active or passive) of the grammatical subject of a verb to the action that the verb denotes

voice (verb)	accompaniment (verb)
give voice to
utter with vibrating vocal chords