What part of speech is the word bright?

The word "bright" can be multiple parts of speech depending on how it's used in a sentence. Here are some examples:

* Adjective: Describing a noun. "The sun is bright."

* Adverb: Modifying a verb, adjective, or another adverb. "The stars shone brightly."

* Noun: Referring to the quality of brightness. "The bright of the sun was blinding."

So, to know the part of speech, you need to look at its function in the sentence.