dolichocephalism vs dolichocephaly

dolichocephalism and dolichocephaly both are nouns.

Word	Noun	Adjective	Verb	Adverb
dolichocephalism	Yes	No	No	No
dolichocephaly	Yes	No	No	No

As nouns, dolichocephalism and dolichocephaly are synonyms defined as:

dolichocephalism and dolichocephaly: the quality of being dolichocephalic

dolichocephalism (noun)	dolichocephaly (noun)
the quality of being dolichocephalic	the quality of being dolichocephalic