bird-on-the-wing vs fringed polygala

bird-on-the-wing and fringed polygala both are nouns.

Word	Noun	Adjective	Verb	Adverb
bird-on-the-wing	Yes	No	No	No
fringed polygala	Yes	No	No	No

As nouns, bird-on-the-wing and fringed polygala are synonyms defined as:

bird-on-the-wing and fringed polygala: common trailing perennial milkwort of eastern North America having leaves like wintergreen and usually rosy-purple flowers with winged sepals

Other synonyms of bird-on-the-wing include flowering wintergreen, gaywings, Polygala paucifolia.

bird-on-the-wing (noun)	fringed polygala (noun)
common trailing perennial milkwort of eastern North America having leaves like wintergreen and usually rosy-purple flowers with winged sepals	common trailing perennial milkwort of eastern North America having leaves like wintergreen and usually rosy-purple flowers with winged sepals