speech vs manner of speaking

speech and manner of speaking both are nouns.

Word	Noun	Adjective	Verb	Adverb
speech	Yes	No	No	No
manner of speaking	Yes	No	No	No

As nouns, speech and manner of speaking are synonyms defined as:

speech and manner of speaking: your characteristic style or manner of expressing yourself orally

Other synonyms of speech include delivery.

speech (noun)	manner of speaking (noun)
the mental faculty or power of vocal communication	your characteristic style or manner of expressing yourself orally
(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