bletia vs orchidaceous plant

bletia and orchidaceous plant both are nouns.

Word	Noun	Adjective	Verb	Adverb
bletia	Yes	No	No	No
orchidaceous plant	Yes	No	No	No

As nouns, orchidaceous plant is a hypernym of bletia; that is, orchidaceous plant is a word with a broader meaning than bletia:

bletia: any of various orchids of the genus Bletia having pseudobulbs and erect leafless racemes of large purple or pink flowers
orchidaceous plant: any of numerous plants of the orchid family usually having flowers of unusual shapes and beautiful colors

Other hypernyms of bletia include orchid.

bletia (noun)	orchidaceous plant (noun)
any of various orchids of the genus Bletia having pseudobulbs and erect leafless racemes of large purple or pink flowers	any of numerous plants of the orchid family usually having flowers of unusual shapes and beautiful colors