As the name suggests, noun modifiers are the modifiers that modify noun entities. These noun entities can be a one-word noun or a noun phrase.

What is considered a modifier noun?

noun modifier (plural noun modifiers) (grammar) a noun which is used attributively to modify or qualify another noun, in a different way to an adjective. For example, in railway station, railway is used as a modifier to describe what kind of station it is.

What are examples of modifiers?

A modifier is a word, phrase, or clause that modifies—that is, gives information about—another word in the same sentence. For example, in the following sentence, the word "burger" is modified by the word "vegetarian": Example: I'm going to the Saturn Café for a vegetarian burger.