I agree. I understand that
priest might have narrower connotations for members of certain groups or denominations, but it's the only relatively neutral catch-all term we have - phenomenologically speaking.
In our world, a shaman is someone who:
- Uses ecstasy as a method to contact a spirit or divine world and "travel" within it
- Acts as an intercessor for spirits to purportedly effect changes in our world - especially divination and healing
- Exhibits dress, speech and other behaviours which set them apart from "regular people"
- Occupies a social role which permits/requires the violation of certain taboos
In the D&D-verse, a shaman is someone who acts as a religious functionary for "primitive" groups and "savage humanoids" - i.e. a priest.