greenhouse vs orangery

greenhouse and orangery both are nouns.

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

As nouns, orangery is a hyponym of greenhouse; that is, orangery is a word with a more specific, narrower meaning than greenhouse:

greenhouse: a building with glass walls and roof; for the cultivation and exhibition of plants under controlled conditions
orangery: a place where oranges are grown; a plantation of orange trees in warm climes or a greenhouse in cooler areas

Other hyponyms of greenhouse include conservatory, hothouse, indoor garden.

greenhouse (noun)	orangery (noun)
a building with glass walls and roof; for the cultivation and exhibition of plants under controlled conditions	a place where oranges are grown; a plantation of orange trees in warm climes or a greenhouse in cooler areas

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