knock-down-and-drag-out vs knockdown-dragout

knock-down-and-drag-out and knockdown-dragout both are adjectives.

Word	Noun	Adjective	Verb	Adverb
knock-down-and-drag-out	No	Yes	No	No
knockdown-dragout	No	Yes	No	No

As adjectives, knock-down-and-drag-out and knockdown-dragout are synonyms defined as:

knock-down-and-drag-out (adjective)	knockdown-dragout (adjective)
extremely violent	extremely violent