inflection vs speech

inflection and speech both are nouns.

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

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

Other hypernyms of inflection include delivery, manner of speaking.

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

inflection: a manner of speaking in which the loudness or pitch or tone of the voice is modified
speech: your characteristic style or manner of expressing yourself orally

Other hypernyms of inflection include delivery, manner of speaking.

inflection (noun)	speech (noun)
the patterns of stress and intonation in a language	the mental faculty or power of vocal communication
a manner of speaking in which the loudness or pitch or tone of the voice is modified	(language) communication by word of mouth
deviation from a straight or normal course	the act of delivering a formal spoken communication to an audience
a change in the form of a word (usually by adding a suffix) to indicate a change in its grammatical function	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