premiership vs berth

premiership and berth both are nouns.

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

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

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

premiership (noun)	berth (noun)
the office of premier	a job in an organization
	a bed on a ship or train; usually in tiers
	a place where a craft can be made fast

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