wood ibis vs Ibis ibis

wood ibis and Ibis ibis both are nouns.

Word	Noun	Adjective	Verb	Adverb
wood ibis	Yes	No	No	No
Ibis ibis	Yes	No	No	No

As nouns, wood ibis and Ibis ibis are synonyms defined as:

wood ibis and Ibis ibis: any of several Old World birds of the genus Ibis

Other synonyms of wood ibis include wood stork.

wood ibis (noun)	Ibis ibis (noun)
an American stork that resembles the true ibises in having a downward-curved bill; inhabits wooded swamps of New World tropics	any of several Old World birds of the genus Ibis
any of several Old World birds of the genus Ibis