The word “seven” is primarily used as a noun.
In English, a noun is a part of speech that refers to a person, place, thing, or idea. In the case of “seven,” it refers to the number itself, which is a concept we quantify. For example, in the sentence “I have seven apples,” the word “seven” identifies the quantity of apples, thus functioning as a noun.
Additionally, “seven” can also act as an adjective when it modifies a noun, such as in the phrase “seven days a week,” where it describes the number of days.
In summary, “seven” can be categorized as both a noun and an adjective depending on how it is used in a sentence.