A word that is a noun verb adjective?

You're looking for a homograph, a word with the same spelling but different meanings and sometimes different pronunciations. There isn't a single word that is a noun, verb, and adjective at the same time, but there are many homographs that can function as at least two of these parts of speech.

Here are some examples:

Noun & Verb:

* Bat: (noun) a nocturnal flying mammal; (verb) to hit a ball with a bat

* Book: (noun) a collection of written or printed pages bound together; (verb) to reserve a place or time for something

* Call: (noun) a request for someone to come; (verb) to speak to someone on the phone

* Change: (noun) a difference or alteration; (verb) to make or become different

* Check: (noun) a mark or symbol used to show that something is correct; (verb) to examine something carefully

Noun & Adjective:

* Cold: (noun) a low temperature; (adjective) having a low temperature

* Fast: (noun) a period of abstaining from food; (adjective) moving or happening quickly

* Green: (noun) the colour of grass; (adjective) having the colour of grass

* Right: (noun) what is morally good; (adjective) correct or accurate

Verb & Adjective:

* Clean: (verb) to remove dirt; (adjective) free from dirt

* Open: (verb) to make something accessible; (adjective) not closed

* Slow: (verb) to move or happen at a low speed; (adjective) moving or happening at a low speed

Let me know if you'd like more examples!