pathologist vs specialist

pathologist and specialist both are nouns.

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

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

Other hypernyms of pathologist include medical specialist.

pathologist (noun)	specialist (noun)
a doctor who specializes in medical diagnosis	an expert who is devoted to one occupation or branch of learning
	practices one branch of medicine