mechanical vs mechanism

mechanical is not a noun while mechanism is a noun.

Word	Noun	Adjective	Verb	Adverb
mechanical	No	Yes	No	No
mechanism	Yes	No	No	No

mechanical (noun)	mechanism (noun)
	the technical aspects of doing something
	device consisting of a piece of machinery; has moving parts that perform some function
	(philosophy) the philosophical theory that all phenomena can be explained in terms of physical or biological causes
	a natural object resembling a machine in structure or function
	the atomic process that occurs during a chemical reaction

mechanical (adjective)	mechanism (adjective)
using (or as if using) mechanisms or tools or devices
relating to or governed by or in accordance with mechanics
relating to or concerned with machinery or tools