interior designer vs specialist

interior designer and specialist both are nouns.

Word	Noun	Adjective	Verb	Adverb
interior designer	Yes	No	No	No
specialist	Yes	No	No	No

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

interior designer: a person who specializes in interior design
specialist: an expert who is devoted to one occupation or branch of learning

Other hypernyms of interior designer include specialiser, specializer.

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