fuller vs workman

fuller and workman both are nouns.

Word	Noun	Adjective	Verb	Adverb
fuller	Yes	No	No	No
workman	Yes	No	No	No

As nouns, workman is a hypernym of fuller; that is, workman is a word with a broader meaning than fuller:

fuller: a workman who fulls (cleans and thickens) freshly woven cloth for a living
workman: an employee who performs manual or industrial labor

Other hypernyms of fuller include working man, working person, workingman.

fuller (noun)	workman (noun)
a workman who fulls (cleans and thickens) freshly woven cloth for a living	an employee who performs manual or industrial labor