Do you mean abstract? An abstract noun would something like "courage" or "valor," or any other object that is not concrete [it cannot be touched, felt, smelled, etc.]

A proper noun is one which is usually the name of someone or someplace, and which is always capitalized, for example, America or John. A common noun is all other nouns - house, door, woman, man, etc. I have no idea what "stract" is.