seditious vs insurgent

seditious is not a noun while insurgent is a noun.

Word	Noun	Adjective	Verb	Adverb
seditious	No	Yes	No	No
insurgent	Yes	Yes	No	No

As adjectives, seditious and insurgent are synonyms defined as:

seditious and insurgent: in opposition to a civil authority or government

Other synonyms of seditious include subversive.

seditious (noun)	insurgent (noun)
	a person who takes part in an armed rebellion against the constituted authority (especially in the hope of improving conditions)
	a member of an irregular armed force that fights a stronger force by sabotage and harassment

seditious (adjective)	insurgent (adjective)
in opposition to a civil authority or government	in opposition to a civil authority or government
arousing to action or rebellion