dockhand vs loader

dockhand and loader both are nouns.

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

As nouns, dockhand and loader are synonyms defined as:

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

dockhand (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