motherese vs babytalk

motherese and babytalk both are nouns.

Word	Noun	Adjective	Verb	Adverb
motherese	Yes	No	No	No
babytalk	Yes	No	No	No

As nouns, motherese and babytalk are synonyms defined as:

motherese and babytalk: an adult's imitation of the speech of a young child

Other synonyms of motherese include baby talk.

motherese (noun)	babytalk (noun)
an adult's imitation of the speech of a young child	the developing speech of a young child
	an adult's imitation of the speech of a young child