Psychology is not a proper noun; rather, it is a common noun. Proper nouns refer to specific names of people, places, or organizations, whereas common nouns denote general categories or concepts.
In the case of ‘psychology,’ it refers to the field of study that examines the mind and behavior of individuals, and it is used generically. For example, when you say, ‘I am studying psychology,’ you are referring to the discipline in a general sense, not naming a specific entity or organization.
However, if you were to refer to a specific branch of psychology, like ‘Cognitive Psychology’ or ‘Freudian Psychology,’ you might consider those as proper nouns in their specific context because they denote particular concepts or schools of thought within the broader field of psychology.