docker vs longshoreman

docker and longshoreman both are nouns.

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

As nouns, docker and longshoreman are synonyms defined as:

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

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

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