The word 'which' is not a noun; which is a pronoun, a word that takes the place of a noun, and an adjective, a word that describes a noun.
The pronoun 'which' is an interrogative pronoun, a word that forms a question; and a relative pronoun, a word that introduces a relative clause. Example uses:
Adjective: Help me decide which shoes go best with this outfit.
Interrogative pronoun: Which is your favorite?
Relative pronoun: My car, which was brand new, was damaged in the parking lot.
The noun 'kind' is an abstract noun. There is no form for kind that is a concrete noun.
The noun 'kind' is an abstact noun as a word for a type or class. The abstract noun form of the adjective "kind" is "kindness".
The word 'kind' is both an adjective and a noun. The noun kind, a singular, common, abstract noun is a word for a group of individuals or instances sharing common traits; a category.The noun forms for the adjective kind are kindness and kindliness.
It's no kind of noun it is an adjective. The noun is ravenousness.
The the noun 'kind' is an abstract noun as a word for type or class; having similar characteristics.The abstract noun for kind is kindness.
The noun "sugar" is a common noun.
The noun "street" is a common noun.
It isn’t a noun at all. Replaces a noun.
A common noun
A common noun.
Proper noun
It is a common noun.