doubter vs agnostic

doubter and agnostic both are nouns.

Word	Noun	Adjective	Verb	Adverb
doubter	Yes	No	No	No
agnostic	Yes	Yes	No	No

As nouns, doubter and agnostic are synonyms defined as:

doubter and agnostic: someone who is doubtful or noncommittal about something

doubter (noun)	agnostic (noun)
someone who habitually doubts accepted beliefs	a person who claims that they cannot have true knowledge about the existence of God (but does not deny that God might exist)
someone who is doubtful or noncommittal about something	someone who is doubtful or noncommittal about something

doubter (adjective)	agnostic (adjective)
	uncertain of all claims to knowledge
	of or pertaining to an agnostic or agnosticism