speech vs soliloquy

speech and soliloquy both are nouns.

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

As nouns, soliloquy is a hyponym of speech; that is, soliloquy is a word with a more specific, narrower meaning than speech:

As nouns, soliloquy is a hyponym of speech; that is, soliloquy is a word with a more specific, narrower meaning than speech:

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

Other hyponyms of speech include aside, cue, monologue, throwaway.

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