tongue-flower vs orchid

tongue-flower and orchid both are nouns.

Word	Noun	Adjective	Verb	Adverb
tongue-flower	Yes	No	No	No
orchid	Yes	No	No	No

As nouns, orchid is a hypernym of tongue-flower; that is, orchid is a word with a broader meaning than tongue-flower:

tongue-flower: orchid having blue to purple flowers with tongue-shaped or strap-shaped protuberances (calli) at the lip base
orchid: any of numerous plants of the orchid family usually having flowers of unusual shapes and beautiful colors

Other hypernyms of tongue-flower include orchidaceous plant.

tongue-flower (noun)	orchid (noun)
orchid having blue to purple flowers with tongue-shaped or strap-shaped protuberances (calli) at the lip base	any of numerous plants of the orchid family usually having flowers of unusual shapes and beautiful colors