caladenia vs orchidaceous plant

caladenia and orchidaceous plant both are nouns.

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

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

caladenia: any of various orchids of the genus Caladenia
orchidaceous plant: any of numerous plants of the orchid family usually having flowers of unusual shapes and beautiful colors

Other hypernyms of caladenia include orchid.

caladenia (noun)	orchidaceous plant (noun)
any of various orchids of the genus Caladenia	any of numerous plants of the orchid family usually having flowers of unusual shapes and beautiful colors