attributes of entity

Question

AoA
Friends i am making database for timetable. the table for this database is
1: Teacher
2: Subject
3: Class room
4: Program
5: Session
6: Day

Now my question is that am i missing entity if yes please share with me.

and next is this that what is the possible attributes for this table.
if some one give me the information about this i shall very very thankful to him/her.