tough vs violent

tough is a noun but violent is not a noun.

Word	Noun	Adjective	Verb	Adverb
tough	Yes	Yes	No	No
violent	No	Yes	No	No

tough (noun)	violent (noun)
an aggressive and violent young criminal
a cruel and brutal fellow
someone who learned to fight in the streets rather than being formally trained in the sport of boxing

tough (adjective)	violent (adjective)
resistant to cutting or chewing	acting with or marked by or resulting from great force or energy or emotional intensity
physically toughened	characterized by violence or bloodshed
not given to gentleness or sentimentality	effected by force or injury rather than natural causes
unfortunate or hard to bear	marked by extreme intensity of emotions or convictions; inclined to react violently; fervid
substantially made or constructed	(of colors or sounds) intensely vivid or loud
feeling physical discomfort or pain (`tough' is occasionally used colloquially for `bad')
violent and lawless
very difficult; severely testing stamina or resolution
making great mental demands; hard to comprehend or solve or believe