What is/are the noun(s) in the following sentence?: The countertop is made out of marble.
A kitchen counter, it is called counter top. Marble--Rock
Where we prepare our foods, a flat surface place. it is a common noun.
Marble is a rock. Both are here common nouns.
A noun is a word for a person, a place, or a thing.
The compound noun "counter top" is a word for a work surface, usually in a kitchen; a word for a thing.
The noun "marble" is a word for a mineral substance; a word for a thing.
A noun functions as the subject of a sentence or a clause, and as the object of a verb or a preposition.
-- "counter top" is the subject of the sentence
-- "marble" is the object of the preposition "of"