babytalk vs motherese

babytalk and motherese both are nouns.

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

As nouns, babytalk and motherese are synonyms defined as:

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

Other synonyms of babytalk include baby talk.

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