mechanism vs mechanical

mechanism is a noun but mechanical is not a noun.

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

mechanism (noun)	mechanical (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

mechanism (adjective)	mechanical (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