mechanism vs natural object

mechanism and natural object both are nouns.

Word	Noun	Adjective	Verb	Adverb
mechanism	Yes	No	No	No
natural object	Yes	No	No	No

As nouns, natural object is a hypernym of mechanism; that is, natural object is a word with a broader meaning than mechanism:

mechanism (noun)	natural object (noun)
the technical aspects of doing something	an object occurring naturally; not made by man
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