somnambulism vs sleepwalking

somnambulism and sleepwalking both are nouns.

Word	Noun	Adjective	Verb	Adverb
somnambulism	Yes	No	No	No
sleepwalking	Yes	No	No	No

As nouns, somnambulism and sleepwalking are synonyms defined as:

Other synonyms of somnambulism include noctambulation, noctambulism, somnambulation.

somnambulism (noun)	sleepwalking (noun)
walking by a person who is asleep	walking by a person who is asleep