talking to vs speech

talking to and speech both are nouns.

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

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

Other synonyms of talking to include lecture.

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