pleasant vs pleasance

pleasant is not a noun while pleasance is a noun.

Word	Noun	Adjective	Verb	Adverb
pleasant	No	Yes	No	No
pleasance	Yes	No	No	No

pleasant (noun)	pleasance (noun)
	a fundamental feeling that is hard to define but that people desire to experience
	a pleasant and secluded part of a garden; usually attached to a mansion

pleasant (adjective)	pleasance (adjective)
affording pleasure; being in harmony with your taste or likings
(of persons) having pleasing manners or behavior