Canterbury bell vs gloxinia

Canterbury bell and gloxinia both are nouns.

Word	Noun	Adjective	Verb	Adverb
Canterbury bell	Yes	No	No	No
gloxinia	Yes	No	No	No

As nouns, gloxinia is a hypernym of Canterbury bell; that is, gloxinia is a word with a broader meaning than Canterbury bell:

Canterbury bell: herb of Colombia to Peru having pale purple flowers
gloxinia: any of several plants of the genera Gloxinia or Sinningia (greenhouse gloxinias) having showy bell-shaped flowers

Canterbury bell (noun)	gloxinia (noun)
herb of Colombia to Peru having pale purple flowers	any of several plants of the genera Gloxinia or Sinningia (greenhouse gloxinias) having showy bell-shaped flowers
European biennial widely cultivated for its blue or violet or white flowers