Is the word colour a verb?

No, "colour" is not a verb in standard English. It is a noun.

However, in some regional dialects or informal speech, "colour" can be used as a verb, meaning "to color" or "to paint."

Here's an example:

* Standard English: "He coloured the picture with crayons."

* Regional Dialect: "He coloured the picture with crayons."

So, while "colour" is not a standard verb, it can be used in certain contexts.