dock worker vs loader

dock worker and loader both are nouns.

Word	Noun	Adjective	Verb	Adverb
dock worker	Yes	No	No	No
loader	Yes	No	No	No

As nouns, dock worker and loader are synonyms defined as:

dock worker and loader: a laborer who loads and unloads vessels in a port

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

dock worker (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