speech vs tone of voice

speech and tone of voice both are nouns.

Word	Noun	Adjective	Verb	Adverb
speech	Yes	No	No	No
tone of voice	Yes	No	No	No

As nouns, tone of voice is a hyponym of speech; that is, tone of voice is a word with a more specific, narrower meaning than speech:

Other hyponyms of speech include address, catch, tongue, shibboleth, tone, elocution, inflection, prosody, inflection, modulation.

speech (noun)	tone of voice (noun)
the mental faculty or power of vocal communication	the quality of a person's voice
(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