black-necked stilt vs Himantopus mexicanus

black-necked stilt and Himantopus mexicanus both are nouns.

Word	Noun	Adjective	Verb	Adverb
black-necked stilt	Yes	No	No	No
Himantopus mexicanus	Yes	No	No	No

As nouns, black-necked stilt and Himantopus mexicanus are synonyms defined as:

black-necked stilt and Himantopus mexicanus: stilt of southwestern United States to northern South America having black plumage extending from the head down the back of the neck

black-necked stilt (noun)	Himantopus mexicanus (noun)
stilt of southwestern United States to northern South America having black plumage extending from the head down the back of the neck	stilt of southwestern United States to northern South America having black plumage extending from the head down the back of the neck