speech vs actor's line

speech and actor's line both are nouns.

Word	Noun	Adjective	Verb	Adverb
speech	Yes	No	No	No
actor's line	Yes	No	No	No

As nouns, speech and actor's line are synonyms defined as:

Other synonyms of speech include words.

speech (noun)	actor's line (noun)
the mental faculty or power of vocal communication	words making up the dialogue of a play
(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