ibis vs wood ibis

ibis and wood ibis both are nouns.

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

As nouns, wood ibis is a hyponym of ibis; that is, wood ibis is a word with a more specific, narrower meaning than ibis:

Other hyponyms of ibis include Ibis ibis, wood stork, sacred ibis, Threskiornis aethiopica.

ibis (noun)	wood ibis (noun)
wading birds of warm regions having long slender down-curved bills	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