soliloquy vs speech

soliloquy and speech both are nouns.

Word	Noun	Adjective	Verb	Adverb
soliloquy	Yes	No	No	No
speech	Yes	No	No	No

As nouns, speech is a hypernym of soliloquy; that is, speech is a word with a broader meaning than soliloquy:

As nouns, speech is a hypernym of soliloquy; that is, speech is a word with a broader meaning than soliloquy:

soliloquy: a (usually long) dramatic speech intended to give the illusion of unspoken reflections
speech: words making up the dialogue of a play

Other hypernyms of soliloquy include actor's line, words.

soliloquy (noun)	speech (noun)
speech you make to yourself	the mental faculty or power of vocal communication
a (usually long) dramatic speech intended to give the illusion of unspoken reflections	(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