teachers and friends; mentors and friends
Refers collectively to one's teachers and friends, often in a context of learning and personal development.
He grew up blessed with many teachers and friends.
respected friend and mentor; friend who is like a teacher
A friend who is deeply respected and from whom one learns much, almost like a teacher. This usage is somewhat literary and less common in everyday speech.
He is a lifelong respected friend and mentor to me.
Compound of 師 (teacher, master) and 友 (friend). The exact historical derivation is uncertain, but the combination naturally expresses a person who is both a teacher and a friend.