lumper vs loader

lumper and loader both are nouns.

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

As nouns, lumper and loader are synonyms defined as:

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

lumper (noun)	loader (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	an attendant who loads guns for someone shooting game