stevedore vs longshoreman

stevedore and longshoreman both are nouns.

Word	Noun	Adjective	Verb	Adverb
stevedore	Yes	No	No	No
longshoreman	Yes	No	No	No

As nouns, stevedore and longshoreman are synonyms defined as:

stevedore and longshoreman: a laborer who loads and unloads vessels in a port

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

stevedore (noun)	longshoreman (noun)
a laborer who loads and unloads vessels in a port	a laborer who loads and unloads vessels in a port