phaius vs orchidaceous plant

phaius and orchidaceous plant both are nouns.

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

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

phaius: an orchid of the genus Phaius having large plicate leaves and racemes of showy flowers
orchidaceous plant: any of numerous plants of the orchid family usually having flowers of unusual shapes and beautiful colors

Other hypernyms of phaius include orchid.

phaius (noun)	orchidaceous plant (noun)
an orchid of the genus Phaius having large plicate leaves and racemes of showy flowers	any of numerous plants of the orchid family usually having flowers of unusual shapes and beautiful colors