hothouse vs glasshouse

hothouse and glasshouse both are nouns.

Word	Noun	Adjective	Verb	Adverb
hothouse	Yes	No	No	No
glasshouse	Yes	No	No	No

As nouns, glasshouse is a hypernym of hothouse; that is, glasshouse is a word with a broader meaning than hothouse:

hothouse: a greenhouse in which plants are arranged in a pleasing manner
glasshouse: a building with glass walls and roof; for the cultivation and exhibition of plants under controlled conditions

Other hypernyms of hothouse include greenhouse.

hothouse (noun)	glasshouse (noun)
a greenhouse in which plants are arranged in a pleasing manner	a building with glass walls and roof; for the cultivation and exhibition of plants under controlled conditions