conjugation vs reunion

conjugation and reunion both are nouns.

Word	Noun	Adjective	Verb	Adverb
conjugation	Yes	No	No	No
reunion	Yes	No	No	No

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

conjugation (noun)	reunion (noun)
the act of pairing a male and female for reproductive purposes	the act of coming together again
the act of making or becoming a single unit	a party of former associates who have come together again
a class of verbs having the same inflectional forms
the complete set of inflected forms of a verb
the inflection of verbs
the state of being joined together