psychotherapy vs therapy

psychotherapy and therapy both are nouns.

Word	Noun	Adjective	Verb	Adverb
psychotherapy	Yes	No	No	No
therapy	Yes	No	No	No

As nouns, therapy is a hypernym of psychotherapy; that is, therapy is a word with a broader meaning than psychotherapy:

psychotherapy: the treatment of mental or emotional problems by psychological means
therapy: (medicine) the act of caring for someone (as by medication or remedial training etc.)

Other hypernyms of psychotherapy include treatment.

psychotherapy (noun)	therapy (noun)
the treatment of mental or emotional problems by psychological means	(medicine) the act of caring for someone (as by medication or remedial training etc.)
the branch of psychiatry concerned with psychological methods