The word 'who' is not a noun.
The word 'who' is a pronoun, an interrogativepronoun and a relative pronoun.
A noun is a word for a person, place, or thing.
A pronoun is a word that takes the place of a noun in a sentence.
An interrogative pronoun is introduces a question; the pronoun takes the place of the noun that is the answer.
Example: Who is your teacher? Mr. Lincoln is my teacher.
A relative pronoun introduces a relative clause (a group of words with a subject and a verb but is not a complete sentence) that 'relates' information about its antecedent.
Example: The person who phoned was your teacher.
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.
It isn’t a noun at all. Replaces a noun.
The noun "street" is a common noun.
The noun "sugar" is a common noun.
A common noun
She is a noun.
Proper noun
It is a common noun.