somniloquism vs sleep talking

somniloquism and sleep talking both are nouns.

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

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

Other synonyms of somniloquism include somniloquy.

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