All right and alright are not interchangeable because ‘alright’ as a word is not completely adopted by the English language. It is not all right to use the word ‘alright’, apparently. Some people say that ‘alright’ is a misspelled word for ‘all right’ but turns out it is not the case.
All right as a word has multiple meanings:
- As an adjective: to be of a satisfactory or acceptable quality.
E.g. Her dance was all right.
- As an adverb: to a satisfactory extent, to do something fairy well.
E.g. They get along all right
- As an exclamation: accepting something or asking for agreement.
E.g. All right! I will do it for you.
- All right is also used to ask a person if they are safe or ok.
E.g. Are you all right?
The form alright is a one-word spelling of the phrase all right. Alright is commonly used in written dialogue and informal writing, but all right is the only acceptable form in edited writing. Basically, it is not all right to use alright in place of all right in standard English.