pertinence vs pertinency

pertinence and pertinency both are nouns.

Word	Noun	Adjective	Verb	Adverb
pertinence	Yes	No	No	No
pertinency	Yes	No	No	No

As nouns, pertinence and pertinency are synonyms defined as:

pertinence and pertinency: relevance by virtue of being applicable to the matter at hand

Other synonyms of pertinence include applicability.

pertinence (noun)	pertinency (noun)
relevance by virtue of being applicable to the matter at hand	relevance by virtue of being applicable to the matter at hand