rougeberry vs houseplant

rougeberry and houseplant both are nouns.

Word	Noun	Adjective	Verb	Adverb
rougeberry	Yes	No	No	No
houseplant	Yes	No	No	No

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

rougeberry: 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

rougeberry (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