relevancy vs pertinence

relevancy and pertinence both are nouns.

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

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

Other hyponyms of relevancy include materiality, cogency, point, applicability, pertinency.

relevancy (noun)	pertinence (noun)
the relation of something to the matter at hand	relevance by virtue of being applicable to the matter at hand