house decorator vs room decorator

house decorator and room decorator both are nouns.

Word	Noun	Adjective	Verb	Adverb
house decorator	Yes	No	No	No
room decorator	Yes	No	No	No

As nouns, house decorator and room decorator are synonyms defined as:

house decorator and room decorator: a person who specializes in interior decoration

Other synonyms of house decorator include decorator, interior decorator.

house decorator (noun)	room decorator (noun)
a person who specializes in interior decoration	a person who specializes in interior decoration