bare-knuckled vs rough-and-tumble

bare-knuckled is not a noun while rough-and-tumble is a noun.

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

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

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

Other synonyms of bare-knuckled include bare-knuckle.

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

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