microscopy vs microscopical

microscopy is a noun but microscopical is not a noun.

Word	Noun	Adjective	Verb	Adverb
microscopy	Yes	No	No	No
microscopical	No	Yes	No	No

microscopy (noun)	microscopical (noun)
research with the use of microscopes

microscopy (adjective)	microscopical (adjective)
	of or relating to or used in microscopy
	so small as to be invisible without a microscope
	visible under a microscope; using a microscope