slowcoach vs trailer

slowcoach and trailer both are nouns.

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

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

slowcoach: someone who moves slowly
trailer: someone who takes more time than necessary; someone who lags behind

Other hypernyms of slowcoach include dawdler, drone, laggard, lagger, poke.

slowcoach (noun)	trailer (noun)
someone who moves slowly	a wheeled vehicle that can be pulled by a car or truck and is equipped for occupancy
	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