pertinent vs apt

pertinent and apt both are adjectives.

Word	Noun	Adjective	Verb	Adverb
pertinent	No	Yes	No	No
apt	No	Yes	No	No

As adjectives, pertinent and apt are synonyms defined as:

Other synonyms of pertinent include apposite.

pertinent (adjective)	apt (adjective)
being of striking appropriateness and pertinence	being of striking appropriateness and pertinence
having precise or logical relevance to the matter at hand	(usually followed by `to') naturally disposed toward
	mentally quick and resourceful
	at risk of or subject to experiencing something usually unpleasant