lady slipper vs orchid

lady slipper and orchid both are nouns.

Word	Noun	Adjective	Verb	Adverb
lady slipper	Yes	No	No	No
orchid	Yes	No	No	No

As nouns, orchid is a hypernym of lady slipper; that is, orchid is a word with a broader meaning than lady slipper:

lady slipper: any of several chiefly American wildflowers having an inflated pouchlike lip; difficult or impossible to cultivate in the garden
orchid: any of numerous plants of the orchid family usually having flowers of unusual shapes and beautiful colors

Other hypernyms of lady slipper include orchidaceous plant.

lady slipper (noun)	orchid (noun)
any of several chiefly American wildflowers having an inflated pouchlike lip; difficult or impossible to cultivate in the garden	any of numerous plants of the orchid family usually having flowers of unusual shapes and beautiful colors