rouge plant vs houseplant

rouge plant and houseplant both are nouns.

Word	Noun	Adjective	Verb	Adverb
rouge plant	Yes	No	No	No
houseplant	Yes	No	No	No

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

rouge plant: bushy houseplant having white to pale pink flowers followed by racemes of scarlet berries; tropical Americas
houseplant: any of a variety of plants grown indoors for decorative purposes

rouge plant (noun)	houseplant (noun)
bushy houseplant having white to pale pink flowers followed by racemes of scarlet berries; tropical Americas	any of a variety of plants grown indoors for decorative purposes