strong-arm vs boss around

strong-arm is an adjective but boss around is not an adjective.

Word	Noun	Adjective	Verb	Adverb
strong-arm	No	Yes	Yes	No
boss around	No	No	Yes	No

As verbs, strong-arm and boss around are synonyms defined as:

Other synonyms of strong-arm include ballyrag, browbeat, bully, bullyrag, hector, push around.

strong-arm (adjective)	boss around (adjective)
impelled by physical force especially against resistance