cohesion vs coherency

cohesion and coherency both are nouns.

Word	Noun	Adjective	Verb	Adverb
cohesion	Yes	No	No	No
coherency	Yes	No	No	No

As nouns, cohesion and coherency are synonyms defined as:

Other synonyms of cohesion include coherence, cohesiveness.

cohesion (noun)	coherency (noun)
(physics) the intermolecular force that holds together the molecules in a solid or liquid	logical and orderly and consistent relation of parts
(botany) the process in some plants of parts growing together that are usually separate (such as petals)	the state of cohering or sticking together
(linguistics) the grammatical and lexical linking within a text or sentence that holds a text together and gives it meaning.
the state of cohering or sticking together