sleep talking vs somniloquy

sleep talking and somniloquy both are nouns.

Word	Noun	Adjective	Verb	Adverb
sleep talking	Yes	No	No	No
somniloquy	Yes	No	No	No

As nouns, sleep talking and somniloquy are synonyms defined as:

Other synonyms of sleep talking include somniloquism.

sleep talking (noun)	somniloquy (noun)
uttering speech while asleep	uttering speech while asleep