teaser vs unwelcome person

teaser and unwelcome person both are nouns.

Word	Noun	Adjective	Verb	Adverb
teaser	Yes	No	No	No
unwelcome person	Yes	No	No	No

As nouns, unwelcome person is a hypernym of teaser; that is, unwelcome person is a word with a broader meaning than teaser:

Other hypernyms of teaser include persona non grata.

teaser (noun)	unwelcome person (noun)
a flat at each side of the stage to prevent the audience from seeing into the wings	a person who for some reason is not wanted or welcome
a device for teasing wool
a particularly baffling problem that is said to have a correct solution
an advertisement that offers something free in order to arouse customers' interest
an attention-getting opening presented at the start of a television show
someone given to teasing (as by mocking or stirring curiosity)
a worker who teases wool