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

He is learning how to use collective nouns.

That is one of the formal nouns.

A noun phrase forms a major part of a sentence.

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

This music is flowing with a pleasant ⠐⠫ along with a beautiful melody.

I'm sorry, but I don't speak Japanese.

I am studying for the Japanese Language Proficiency Test next year.

The government declared a state of emergency to prevent the spread of the new coronavirus.

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