What are the two words in psychology?

It's not possible to say there are "two words in psychology" as that doesn't make sense in the context of the field. Psychology is a broad field with many concepts, theories, and terms.

Could you clarify what you're looking for?

For example, are you asking about:

* Two important concepts in psychology?

* Two commonly used terms in psychology?

* Two words that represent the core of psychology?

Please give me more information so I can understand your question and give you a helpful answer.