selfsame

As adjectives the difference between selfsame and selfsome

is that selfsame is precisely the same; the very same; identical while selfsome is (neologism) of or characteristic of self or one's self.

As a noun selfname

is a proper name; a name for one's own self, as opposed to one's family; one's real name.

As an adjective selfsame is

precisely the same; the very same; identical.

As a noun taxonomy

is the science or the technique used to make a classification.

As an adjective selfsame is

precisely the same; the very same; identical.