conjunction vs unison

conjunction and unison both are nouns.

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

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

Other hyponyms of conjunction include concomitance, overlap, contemporaneity, contemporaneousness.

conjunction (noun)	unison (noun)
something that joins or connects	(music) two or more sounds or tones at the same pitch or in octaves
the temporal property of two things happening at the same time	occurring together or simultaneously
an uninflected function word that serves to conjoin words or phrases or clauses or sentences	corresponding exactly
(astronomy) apparent meeting or passing of two or more celestial bodies in the same degree of the zodiac
the grammatical relation between linguistic units (words or phrases or clauses) that are connected by a conjunction
the state of being joined together