As adjectives the difference between surangular and subangular
is that surangular is (anatomy) above the angular bone; supra-angular while subangular is (geology) slightly angular; having rather blunt angles.
As a noun surangular
is (anatomy) a bone of the lower jaw in many reptiles and birds.
surangular
English
Adjective
(
en adjective)
(anatomy) Above the angular bone; supra-angular
Noun
(
en noun)
(anatomy) A bone of the lower jaw in many reptiles and birds. subangular
English
Adjective
(-)
(geology) Slightly angular; having rather blunt angles