politician vs governor

politician and governor both are nouns.

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

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

Other hyponyms of politician include legislator, city manager, mayor.

politician (noun)	governor (noun)
a person active in party politics	a control that maintains a steady speed in a machine (as by controlling the supply of fuel)
a leader engaged in civil administration	the head of a state government
a schemer who tries to gain advantage in an organization in sly or underhanded ways