microscope vs microscopical

microscope is a noun but microscopical is not a noun.

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

microscope (noun)	microscopical (noun)
magnifier of the image of small objects

microscope (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