cranial index vs breadth index

cranial index and breadth index both are nouns.

Word	Noun	Adjective	Verb	Adverb
cranial index	Yes	No	No	No
breadth index	Yes	No	No	No

As nouns, cranial index and breadth index are synonyms defined as:

cranial index and breadth index: ratio (in percent) of the maximum breadth to the maximum length of a skull

Other synonyms of cranial index include cephalic index.

cranial index (noun)	breadth index (noun)
ratio (in percent) of the maximum breadth to the maximum length of a skull	ratio (in percent) of the maximum breadth to the maximum length of a skull