relevance vs pertinence

relevance and pertinence both are nouns.

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

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

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

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