Meanings
Usage patterns
〈場所〉で講師を務めるto serve as a lecturer/instructor at a place
He works as a lecturer at a university.
講師を招くto invite a lecturer/speaker
We invited a famous speaker to the seminar.
講師として〈事〉を教えるto teach something in the capacity of a lecturer/instructor
She teaches English as an instructor.
〈人〉が講師を依頼するto ask someone to be a speaker/lecturer
The school asked an expert to be a guest speaker.