dolichocephaly vs dolichocephalism

dolichocephaly and dolichocephalism both are nouns.

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

As nouns, dolichocephaly and dolichocephalism are synonyms defined as:

dolichocephaly and dolichocephalism: the quality of being dolichocephalic

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