sermon vs speech

sermon and speech both are nouns.

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

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

sermon: an address of a religious nature (usually delivered during a church service)
speech: the act of delivering a formal spoken communication to an audience

Other hypernyms of sermon include address.

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

Other hypernyms of sermon include lecture, talking to.

sermon (noun)	speech (noun)
an address of a religious nature (usually delivered during a church service)	the mental faculty or power of vocal communication
a moralistic rebuke	(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