What is his real name?

'Apple' is a count noun, and you can count it as one, two, etc.

Compound nouns are a very important part of Japanese grammar.

A common noun refers to a noun that does not point to a specific person or thing.

A proper noun is a noun that refers to a specific person, place, or thing.

He is learning how to use collective nouns.

A noun phrase forms a major part of a sentence.

Nominalization is the linguistic process of converting verbs or adjectives into nouns.

The one-eyed goblin was dancing in the forest.

Happiness is a mass noun, you can't count it.