Intellectual Faculties

Mind:
Collection of thoughts is termed as mind
it is the element of a person that enables them to be aware of the world and their experiences, to think, and to feel; the faculty of consciousness and thought.

The function of mind is Imagination.
  
Intellect: 
 The faculty of reasoning and understanding objectively, especially with regard to abstract matters.

Subconscious mind: 
 Underneath the layers of critical-thought functions of the conscious mind lay a powerful awareness that he called the subconscious mind. 

Ego: 
A person's sense of self-esteem or self-importance