Create rapport and trust. Then proceed to bring up some of the terms, in private, along with some reference supporting the correct use. Frame it as something yo

Create rapport and trust. Then proceed to bring up some of the terms, in private, along with some reference supporting the correct use. Frame it as something you noticed he mentioned and wondered about so you looked it up. Never frame as right or wrong. Proceed with steps beyond #1 only when you have enough trust and rapport. Never correct in public.