isometry vs isometrical

isometry is a noun but isometrical is not a noun.

Word	Noun	Adjective	Verb	Adverb
isometry	Yes	No	No	No
isometrical	No	Yes	No	No

isometry (noun)	isometrical (noun)
equality of measure (e.g., equality of height above sea level or equality of loudness etc.)
equality of elevation above sea level
a one-to-one mapping of one metric space into another metric space that preserves the distances between each pair of points
the growth rates in different parts of a growing organism are the same

isometry (adjective)	isometrical (adjective)
	having equal dimensions or measurements