chapiter

As a noun chapiter

is (architecture) the 'capital' or uppermost part of a column, upon which the roof and its decorations are supported.

As an adjective undefined is

lacking a definition or value.

As nouns the difference between taxonomy and chapiter

is that taxonomy is the science or the technique used to make a classification while chapiter is (architecture) the 'capital' or uppermost part of a column, upon which the roof and its decorations are supported.