orthoepy vs speech

orthoepy and speech both are nouns.

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

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

orthoepy (noun)	speech (noun)
a term formerly used for the part of phonology that dealt with the `correct' pronunciation of words and its relation to `correct' orthography	the mental faculty or power of vocal communication
the way a word or a language is customarily spoken	(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