ruffian vs roughneck

ruffian and roughneck both are nouns.

Word	Noun	Adjective	Verb	Adverb
ruffian	Yes	No	No	No
roughneck	Yes	No	No	No

As nouns, ruffian and roughneck are synonyms defined as:

Other synonyms of ruffian include bully, hooligan, rowdy, tough, yob, yobbo, yobo.

ruffian (noun)	roughneck (noun)
a cruel and brutal fellow	a cruel and brutal fellow