tough vs tough-skinned

tough is a noun but tough-skinned is not a noun.

Word	Noun	Adjective	Verb	Adverb
tough	Yes	Yes	No	No
tough-skinned	No	Yes	No	No

tough (noun)	tough-skinned (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)	tough-skinned (adjective)
resistant to cutting or chewing	insensitive to criticism
physically toughened	having a relatively tough outer covering
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