graphologist vs specializer

graphologist and specializer both are nouns.

Word	Noun	Adjective	Verb	Adverb
graphologist	Yes	No	No	No
specializer	Yes	No	No	No

As nouns, specializer is a hypernym of graphologist; that is, specializer is a word with a broader meaning than graphologist:

graphologist: a specialist in inferring character from handwriting
specializer: an expert who is devoted to one occupation or branch of learning

Other hypernyms of graphologist include specialiser, specialist.

graphologist (noun)	specializer (noun)
a specialist in inferring character from handwriting	an expert who is devoted to one occupation or branch of learning