swanneck vs orchidaceous plant

swanneck and orchidaceous plant both are nouns.

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

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

swanneck: any of several orchids of the genus Cycnoches having slender arching columns of flowers suggesting the neck of a swan
orchidaceous plant: any of numerous plants of the orchid family usually having flowers of unusual shapes and beautiful colors

Other hypernyms of swanneck include orchid.

swanneck (noun)	orchidaceous plant (noun)
any of several orchids of the genus Cycnoches having slender arching columns of flowers suggesting the neck of a swan	any of numerous plants of the orchid family usually having flowers of unusual shapes and beautiful colors