indoor garden vs hothouse

indoor garden and hothouse both are nouns.

Word	Noun	Adjective	Verb	Adverb
indoor garden	Yes	No	No	No
hothouse	Yes	No	No	No

As nouns, indoor garden and hothouse are synonyms defined as:

indoor garden and hothouse: a greenhouse in which plants are arranged in a pleasing manner

Other synonyms of indoor garden include conservatory.

indoor garden (noun)	hothouse (noun)
a greenhouse in which plants are arranged in a pleasing manner	a greenhouse in which plants are arranged in a pleasing manner