house decorator vs specialist

house decorator and specialist both are nouns.

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

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

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

Other hypernyms of house decorator include specialiser, specializer.

house 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