speech vs talking to

speech and talking to both are nouns.

Word	Noun	Adjective	Verb	Adverb
speech	Yes	No	No	No
talking to	Yes	No	No	No

As nouns, speech and talking to are synonyms defined as:

Other synonyms of speech include lecture.

speech (noun)	talking to (noun)
the mental faculty or power of vocal communication	a lengthy 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