longshoreman vs lumper

longshoreman and lumper both are nouns.

Word	Noun	Adjective	Verb	Adverb
longshoreman	Yes	No	No	No
lumper	Yes	No	No	No

As nouns, longshoreman and lumper are synonyms defined as:

longshoreman and lumper: a laborer who loads and unloads vessels in a port

Other synonyms of longshoreman include dock-walloper, dock worker, docker, dockhand, dockworker, loader, stevedore.

longshoreman (noun)	lumper (noun)
a laborer who loads and unloads vessels in a port	a taxonomist who classifies organisms into large groups on the basis of major characteristics
	a laborer who loads and unloads vessels in a port