wader vs button quail

wader and button quail both are nouns.

Word	Noun	Adjective	Verb	Adverb
wader	Yes	No	No	No
button quail	Yes	No	No	No

As nouns, button quail is a hyponym of wader; that is, button quail is a word with a more specific, narrower meaning than wader:

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

wader (noun)	button quail (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