unison vs accord

unison and accord both are nouns.

Word	Noun	Adjective	Verb	Adverb
unison	Yes	No	No	No
accord	Yes	No	Yes	No

As nouns, accord is a hypernym of unison; that is, accord is a word with a broader meaning than unison:

Other hypernyms of unison include agreement.

unison (noun)	accord (noun)
(music) two or more sounds or tones at the same pitch or in octaves	sympathetic compatibility
occurring together or simultaneously	concurrence of opinion
corresponding exactly	a written agreement between two states or sovereigns
	harmony of people's opinions or actions or characters

unison (verb)	accord (verb)
	allow to have
	go together