speech therapy vs therapy

speech therapy and therapy both are nouns.

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

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

speech therapy: any therapy intended to correct a disorder of speech
therapy: (medicine) the act of caring for someone (as by medication or remedial training etc.)

Other hypernyms of speech therapy include treatment.

speech therapy (noun)	therapy (noun)
any therapy intended to correct a disorder of speech	(medicine) the act of caring for someone (as by medication or remedial training etc.)