isometrical vs isometric

isometrical is not a noun while isometric is a noun.

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

As adjectives, isometrical and isometric are synonyms defined as:

isometrical (noun)	isometric (noun)
	a line connecting isometric points

isometrical (adjective)	isometric (adjective)
having equal dimensions or measurements	of or involving muscular contraction in which tension increases while length remains constant
	related by an isometry
	of a crystal system characterized by three equal axes at right angles
	having equal dimensions or measurements