adjective and adverb
Note: The spelling alright is likely to raise the eyebrows of your readers. The fused words already and altogether arose in the middle ages and are properly spelled. But alright arose only a hundred years ago and prompted language critics to deem it a misspelling.
See Grammar.com's section on Problem Words for a discussion on all right.
Example: He checked to see if his tires were all right. adjective
Example: The witness held up all right under cross-examination. adverb