lumper vs dockworker

lumper and dockworker both are nouns.

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

As nouns, lumper and dockworker are synonyms defined as:

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

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

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