appear vs appearance

appear is not a noun while appearance is a noun.

Word	Noun	Adjective	Verb	Adverb
appear	No	No	Yes	No
appearance	Yes	No	No	No

appear (noun)	appearance (noun)
	the act of appearing in public view
	formal attendance (in court or at a hearing) of a party in an action
	pretending that something is the case in order to make a good impression
	outward or visible aspect of a person or thing
	a mental representation
	the event of coming into sight

appear (verb)	appearance (verb)
come into sight or view
be issued or published
come into being or existence, or appear on the scene
appear as a character on stage or appear in a play, etc.
give a certain impression of being something or having a certain aspect
(of a proposition) seem to be true, probable, or apparent
present oneself formally, as before a (judicial) authority