beautiful is this a sentence phrase or clause?

"Beautiful" is a word, not a sentence, phrase, or clause. It's an adjective describing something.

Here's how to break it down:

* Sentence: A complete thought with a subject and a verb. Example: "The sunset is beautiful."

* Phrase: A group of related words without a subject and verb. Example: "very beautiful"

* Clause: A group of related words with a subject and verb. Example: "because it is beautiful"