Identification & Authorisation are a better pairing here than Authentication and Authorisation. This way, if someone says "Oh yeah we have an auth module on th

Identification & Authorisation are a better pairing here than Authentication and Authorisation. This way, if someone says "Oh yeah we have an auth module on this site" you don't need to immediately disambiguate the statement. But then "auth" itself is ambiguous. So it might make sense to get rid of the lot. "Identification" is a good word for the first. Perhaps "Permissions" for the second?