coalescency vs conjugation

coalescency and conjugation both are nouns.

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

As nouns, conjugation is a hypernym of coalescency; that is, conjugation is a word with a broader meaning than coalescency:

coalescency: the union of diverse things into one body or form or group; the growing together of parts
conjugation: the act of making or becoming a single unit

Other hypernyms of coalescency include jointure, unification, union, uniting.

coalescency (noun)	conjugation (noun)
the union of diverse things into one body or form or group; the growing together of parts	the act of pairing a male and female for reproductive purposes
	the act of making or becoming a single unit
	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