presidential term vs incumbency

presidential term and incumbency both are nouns.

Word	Noun	Adjective	Verb	Adverb
presidential term	Yes	No	No	No
incumbency	Yes	No	No	No

As nouns, incumbency is a hypernym of presidential term; that is, incumbency is a word with a broader meaning than presidential term:

Other hypernyms of presidential term include tenure, term of office.

presidential term (noun)	incumbency (noun)
the tenure of a president	the office of an incumbent
	a duty that is incumbent upon you
	the term during which some position is held