lion monkey vs leoncita

lion monkey and leoncita both are nouns.

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

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

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

Other synonyms of lion monkey include lion marmoset, tamarin.

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