dockworker vs loader

dockworker and loader both are nouns.

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

As nouns, dockworker and loader are synonyms defined as:

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

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

dockworker (noun)	loader (noun)
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