trailer vs advertizement

trailer and advertizement both are nouns.

Word	Noun	Adjective	Verb	Adverb
trailer	Yes	No	No	No
advertizement	Yes	No	No	No

As nouns, advertizement is a hypernym of trailer; that is, advertizement is a word with a broader meaning than trailer:

trailer: an advertisement consisting of short scenes from a motion picture that will appear in the near future
advertizement: a public promotion of some product or service

Other hypernyms of trailer include ad, advert, advertisement, advertising, advertizing.

trailer (noun)	advertizement (noun)
a wheeled vehicle that can be pulled by a car or truck and is equipped for occupancy	a public promotion of some product or service
a large transport conveyance designed to be pulled by a truck or tractor
an advertisement consisting of short scenes from a motion picture that will appear in the near future
someone who takes more time than necessary; someone who lags behind