motherese vs baby talk

motherese and baby talk both are nouns.

Word	Noun	Adjective	Verb	Adverb
motherese	Yes	No	No	No
baby talk	Yes	No	No	No

As nouns, motherese and baby talk are synonyms defined as:

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

Other synonyms of motherese include babytalk.

motherese (noun)	baby talk (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