incumbency vs berth

incumbency and berth both are nouns.

Word	Noun	Adjective	Verb	Adverb
incumbency	Yes	No	No	No
berth	Yes	No	Yes	No

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

Other hypernyms of incumbency include office, place, position, post, situation.

incumbency (noun)	berth (noun)
the office of an incumbent	a job in an organization
a duty that is incumbent upon you	a bed on a ship or train; usually in tiers
the term during which some position is held	a place where a craft can be made fast

incumbency (verb)	berth (verb)
	secure in or as if in a berth or dock
	come into or dock at a wharf
	provide with a berth