lady's-slipper vs orchid

lady's-slipper and orchid both are nouns.

Word	Noun	Adjective	Verb	Adverb
lady's-slipper	Yes	No	No	No
orchid	Yes	No	No	No

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

lady's-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's-slipper include orchidaceous plant.

lady's-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