There are a great number of compound nouns formed using the noun + noun combination. For example: backpack.

What type of word is backpack?

backpack used as a noun:

A knapsack, sometimes mounted on a light frame, but always supported by straps, worn on a person's back for the purpose of carrying things, especially when hiking, or on a student's back when carrying books.

What is a compound word examples?

Compound words are formed when two or more words are joined together to create a new word that has an entirely new meaning. ... For example, “sun” and “flower” are two different words, but when fused together, they form another word, Sunflower.