lady's-slipper vs slipper orchid

lady's-slipper and slipper orchid both are nouns.

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

As nouns, lady's-slipper and slipper orchid are synonyms defined as:

lady's-slipper and slipper orchid: any of several chiefly American wildflowers having an inflated pouchlike lip; difficult or impossible to cultivate in the garden

Other synonyms of lady's-slipper include ladies' slipper, lady's slipper, lady-slipper, lady slipper.

lady's-slipper (noun)	slipper orchid (noun)
any of several chiefly American wildflowers having an inflated pouchlike lip; difficult or impossible to cultivate in the garden	any of several chiefly American wildflowers having an inflated pouchlike lip; difficult or impossible to cultivate in the garden