tough vs toughness

tough and toughness both are nouns.

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

tough (noun)	toughness (noun)
an aggressive and violent young criminal	the property of being big and strong
a cruel and brutal fellow	enduring strength and energy
someone who learned to fight in the streets rather than being formally trained in the sport of boxing	impressive difficulty
	the elasticity and hardness of a metal object; its ability to absorb considerable energy before cracking

tough (adjective)	toughness (adjective)
resistant to cutting or chewing
physically toughened
not given to gentleness or sentimentality
unfortunate or hard to bear
substantially made or constructed
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