loader vs lumper

loader and lumper both are nouns.

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

As nouns, loader and lumper are synonyms defined as:

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

loader (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
an attendant who loads guns for someone shooting game	a laborer who loads and unloads vessels in a port