Question

fortify is a verb that means \to protect and strengthen.\ a fortification is a that means \something that protects.\

Explanation:

The word "fortification" is a noun. In English grammar, nouns are words that name people, places, things, or ideas. Here, "fortification" refers to a thing (something that protects). Verbs are action words (like "fortify" which means to protect and strengthen), adverbs modify verbs, adjectives, or other adverbs, and adjectives describe nouns. Since "fortification" is a thing (a concept related to protection), it fits the noun category.

Answer:

noun