speech vs speech production

speech and speech production both are nouns.

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

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

Other hypernyms of speech include speaking.

speech (noun)	speech production (noun)
the mental faculty or power of vocal communication	the utterance of intelligible speech
(language) communication by word of mouth
the act of delivering a formal spoken communication to an audience
words making up the dialogue of a play
a lengthy rebuke
the exchange of spoken words
your characteristic style or manner of expressing yourself orally
something spoken