episcia vs houseplant

episcia and houseplant both are nouns.

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

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

episcia: any plant of the genus Episcia; usually creeping and stoloniferous and of cascading habit; grown for their colorful foliage and flowers
houseplant: any of a variety of plants grown indoors for decorative purposes

episcia (noun)	houseplant (noun)
any plant of the genus Episcia; usually creeping and stoloniferous and of cascading habit; grown for their colorful foliage and flowers	any of a variety of plants grown indoors for decorative purposes