bully vs bullyboy

bully and bullyboy both are nouns.

Word	Noun	Adjective	Verb	Adverb
bully	Yes	Yes	Yes	No
bullyboy	Yes	No	No	No

As nouns, bullyboy is a hyponym of bully; that is, bullyboy is a word with a more specific, narrower meaning than bully:

bully: a cruel and brutal fellow
bullyboy: a swaggering tough; usually one acting as an agent of a political faction

Other hyponyms of bully include muscle, muscleman, skin, skinhead, plug-ugly, tough guy.

bully (noun)	bullyboy (noun)
a cruel and brutal fellow	a swaggering tough; usually one acting as an agent of a political faction
a hired thug

bully (adjective)	bullyboy (adjective)
excellent

bully (verb)	bullyboy (verb)
discourage or frighten with threats or a domineering manner; intimidate
be bossy towards