trailer vs potterer

trailer and potterer both are nouns.

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

As nouns, potterer is a hyponym of trailer; that is, potterer is a word with a more specific, narrower meaning than trailer:

trailer: someone who takes more time than necessary; someone who lags behind
potterer: a person who putters about

trailer (noun)	potterer (noun)
a wheeled vehicle that can be pulled by a car or truck and is equipped for occupancy	a person who putters about
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