breadth index vs cranial index

breadth index and cranial index both are nouns.

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

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

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

Other synonyms of breadth index include cephalic index.

breadth index (noun)	cranial 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