rough-and-tumble vs bare-knuckle

rough-and-tumble is a noun but bare-knuckle is not a noun.

Word	Noun	Adjective	Verb	Adverb
rough-and-tumble	Yes	Yes	No	No
bare-knuckle	No	Yes	No	No

As adjectives, rough-and-tumble and bare-knuckle are synonyms defined as:

rough-and-tumble and bare-knuckle: characterized by disorderly action and disregard for rules

Other synonyms of rough-and-tumble include bare-knuckled.

rough-and-tumble (noun)	bare-knuckle (noun)
disorderly fighting

rough-and-tumble (adjective)	bare-knuckle (adjective)
characterized by disorderly action and disregard for rules	characterized by disorderly action and disregard for rules