Mentor noun – A wise and trusted guide and advisor. Role model and mentor are semantically related In some cases you can use "Role model" instead a noun "Mentor".
Role model noun – Someone worthy of imitation. Mentor and role model are semantically related in someone worth imitating topic. You can use "Mentor" instead a noun phrase "Role model".
Lars von Trier gets to work with and even impersonate his lifetime mentor and role model Jørgen Leth in a documentary film called The Five Obstructions.