wading bird vs hemipode

wading bird and hemipode both are nouns.

Word	Noun	Adjective	Verb	Adverb
wading bird	Yes	No	No	No
hemipode	Yes	No	No	No

As nouns, hemipode is a hyponym of wading bird; that is, hemipode is a word with a more specific, narrower meaning than wading bird:

wading bird: any of many long-legged birds that wade in water in search of food
hemipode: small quail-like terrestrial bird of southern Eurasia and northern Africa that lacks a hind toe; classified with wading birds but inhabits grassy plains

wading bird (noun)	hemipode (noun)
any of many long-legged birds that wade in water in search of food	small quail-like terrestrial bird of southern Eurasia and northern Africa that lacks a hind toe; classified with wading birds but inhabits grassy plains