lion marmoset vs lion monkey

lion marmoset and lion monkey both are nouns.

Word	Noun	Adjective	Verb	Adverb
lion marmoset	Yes	No	No	No
lion monkey	Yes	No	No	No

As nouns, lion marmoset and lion monkey are synonyms defined as:

lion marmoset and lion monkey: small South American marmoset with silky fur and long nonprehensile tail

Other synonyms of lion marmoset include leoncita, tamarin.

lion marmoset (noun)	lion monkey (noun)
small South American marmoset with silky fur and long nonprehensile tail	small South American marmoset with silky fur and long nonprehensile tail