leoncita vs lion monkey

leoncita and lion monkey both are nouns.

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

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

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

Other synonyms of leoncita include lion marmoset, tamarin.

leoncita (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