room decorator vs specialist

room decorator and specialist both are nouns.

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

As nouns, specialist is a hypernym of room decorator; that is, specialist is a word with a broader meaning than room decorator:

room decorator: a person who specializes in interior decoration
specialist: an expert who is devoted to one occupation or branch of learning

Other hypernyms of room decorator include specialiser, specializer.

room decorator (noun)	specialist (noun)
a person who specializes in interior decoration	an expert who is devoted to one occupation or branch of learning
	practices one branch of medicine