You are expected to know those that apply to you. Teachers remind you of your incomplete work. Professors may not remind you of your incomplete work. Teachers approach you if they believe you need assistance. Professors are usually open and helpful, but most expect you to initiate contact if you need assistance.
Teachers are often available for conversation before, during, or after class.
Professors expect and want you to attend their scheduled office hours. Teachers have been trained in teaching methods to assist in imparting knowledge to students. Professors have been trained as experts in their particular areas of research. Teachers provide you with information you missed when you were absent. Professors expect you to get from classmates any notes from classes you missed.