cryptologist vs decipherer

cryptologist and decipherer both are nouns.

Word	Noun	Adjective	Verb	Adverb
cryptologist	Yes	No	No	No
decipherer	Yes	No	No	No

As nouns, decipherer is a hypernym of cryptologist; that is, decipherer is a word with a broader meaning than cryptologist:

cryptologist: decoder skilled in the analysis of codes and cryptograms
decipherer: the kind of intellectual who converts messages from a code to plain text

Other hypernyms of cryptologist include decoder.

cryptologist (noun)	decipherer (noun)
decoder skilled in the analysis of codes and cryptograms	a reader capable of reading and interpreting illegible or obscure text
	the kind of intellectual who converts messages from a code to plain text