frictional vs friction

frictional is not a noun while friction is a noun.

Word	Noun	Adjective	Verb	Adverb
frictional	No	Yes	No	No
friction	Yes	No	No	No

frictional (noun)	friction (noun)
	effort expended in moving one object over another with pressure
	the resistance encountered when one body is moved in contact with another
	a state of conflict between persons

frictional (adjective)	friction (adjective)
pertaining to or worked or produced by friction