psyche vs knowledge

psyche and knowledge both are nouns.

Word	Noun	Adjective	Verb	Adverb
psyche	Yes	No	No	No
knowledge	Yes	No	No	No

As nouns, knowledge is a hypernym of psyche; that is, knowledge is a word with a broader meaning than psyche:

psyche: that which is responsible for one's thoughts, feelings, and conscious brain functions; the seat of the faculty of reason
knowledge: the psychological result of perception and learning and reasoning

Other hypernyms of psyche include cognition, noesis.

psyche (noun)	knowledge (noun)
that which is responsible for one's thoughts, feelings, and conscious brain functions; the seat of the faculty of reason	the psychological result of perception and learning and reasoning
the immaterial part of a person; the actuating cause of an individual life