greenhouse vs glasshouse

greenhouse and glasshouse both are nouns.

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

As nouns, greenhouse and glasshouse are synonyms defined as:

greenhouse and glasshouse: a building with glass walls and roof; for the cultivation and exhibition of plants under controlled conditions

greenhouse (noun)	glasshouse (noun)
a building with glass walls and roof; for the cultivation and exhibition of plants under controlled conditions	a building with glass walls and roof; for the cultivation and exhibition of plants under controlled conditions

greenhouse (adjective)	glasshouse (adjective)
of or relating to or caused by the greenhouse effect