hardened vs tough

hardened is not a noun while tough is a noun.

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

hardened (noun)	tough (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

hardened (adjective)	tough (adjective)
made hard or flexible or resilient especially by heat treatment	resistant to cutting or chewing
protected against attack (especially by nuclear weapons)	physically toughened
made tough by habitual exposure	not given to gentleness or sentimentality
converted to solid form (as concrete)	unfortunate or hard to bear
used of persons; emotionally hardened	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