sequential vs sequence

sequential is not a noun while sequence is a noun.

Word	Noun	Adjective	Verb	Adverb
sequential	No	Yes	No	No
sequence	Yes	No	Yes	No

sequential (noun)	sequence (noun)
	the action of following in order
	film consisting of a succession of related shots that develop a given subject in a movie
	a following of one thing after another in time
	several repetitions of a melodic phrase in different keys
	serial arrangement in which things follow in logical order or a recurrent pattern

sequential (adjective)	sequence (adjective)
in regular succession without gaps

sequential (verb)	sequence (verb)
	arrange in a sequence
	determine the order of constituents in