schemer vs politician

schemer and politician both are nouns.

Word	Noun	Adjective	Verb	Adverb
schemer	Yes	No	No	No
politician	Yes	No	No	No

As nouns, politician is a hyponym of schemer; that is, politician is a word with a more specific, narrower meaning than schemer:

schemer: a planner who draws up a personal scheme of action
politician: a schemer who tries to gain advantage in an organization in sly or underhanded ways

Other hyponyms of schemer include angler.

schemer (noun)	politician (noun)
a planner who draws up a personal scheme of action	a person active in party politics
	a leader engaged in civil administration
	a schemer who tries to gain advantage in an organization in sly or underhanded ways