The word 'who' is not a noun. The word 'who' is a pronoun, a word that takes the place of a noun in a sentence.
The pronoun 'who' is an interrogative pronoun, a word that introduces a question. The interrogative pronoun 'who' takes the place of the noun for the person that is the answer to the question.
The pronoun 'who' is a relative pronoun, a word that introduces a relative clause. A relative pronoun takes the place of the noun, giving information about that noun.
Examples:
Who is our new math teacher? (interrogative)
A teacher who transferred from Midway is our new teacher. (relative)
What type of noun is the word Dell computer What type of noun is the word Dell computer
No, the noun 'bear' is a concrete noun, a word for a type of mammal, a word for a physical thing.
The noun 'elephants' is a plural, common, concrete noun; a word for a type of mammal; a word for a living things.
The noun 'carrot' is a singular, common, concrete noun; a word for a type of vegetable, a word for a plant, a word for a thing.
The noun 'kittens' is a plural, common, concrete noun; a word for a type of mammal; a word for things.
The noun 'federalism' is a common, uncountable, abstract noun; a word for a type of government; a word for a concept.
The noun porch is a singular, common, concrete noun; a word for a type of structure, a thing.
The noun 'hamster' is a singular, common, concrete noun; a word for a type of mammal; a word for a thing.
The noun 'cat' is a singular, common, concrete noun; a word for a type of animal; a word for a thing.
Yes, the word 'cedar' is a noun, a word for a type of tree, a word for the wood from this type of tree; a word for a thing.
The noun coffee is a singular, common, concrete noun, a word for a thing.
The noun 'grapes' is a common, concrete noun; the plural form of the singular noun 'grape', a word for a thing.