head-shrinker vs specialist

head-shrinker and specialist both are nouns.

Word	Noun	Adjective	Verb	Adverb
head-shrinker	Yes	No	No	No
specialist	Yes	No	No	No

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

Other hypernyms of head-shrinker include medical specialist.

head-shrinker (noun)	specialist (noun)
a savage who cuts off and preserves the heads of enemies as trophies	an expert who is devoted to one occupation or branch of learning
a physician who specializes in psychiatry	practices one branch of medicine