sequent vs incidental

sequent is not a noun while incidental is a noun.

Word	Noun	Adjective	Verb	Adverb
sequent	No	Yes	No	No
incidental	Yes	Yes	No	No

As adjectives, sequent and incidental are synonyms defined as:

Other synonyms of sequent include accompanying, attendant, collateral, concomitant, consequent, ensuant, resultant.

sequent (noun)	incidental (noun)
	an item that is incidental
	(frequently plural) an expense not budgeted or not specified

sequent (adjective)	incidental (adjective)
in regular succession without gaps	(sometimes followed by `to') minor or casual or subordinate in significance or nature or occurring as a chance concomitant or consequence
occurring with or following as a consequence	not of prime or central importance
	occurring with or following as a consequence