Is the word looks an adjective?

No, "looks" is not an adjective. It is a verb, specifically the third person singular present tense form of the verb "look".

Here's why:

* Verbs describe actions or states of being. In the sentence "She looks beautiful," "looks" describes the action of appearing or seeming.

* Adjectives modify nouns or pronouns, describing their qualities. While "beautiful" is an adjective in this sentence, "looks" is not.

Examples:

* Verb: "He looks tired." (Describes the action of appearing tired)

* Adjective: "The tired man sat down." (Describes the man's state)