radiographer vs specialist

radiographer and specialist both are nouns.

Word	Noun	Adjective	Verb	Adverb
radiographer	Yes	No	No	No
specialist	Yes	No	No	No

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

Other hypernyms of radiographer include medical specialist.

radiographer (noun)	specialist (noun)
a person who makes radiographs	an expert who is devoted to one occupation or branch of learning
	practices one branch of medicine