radiator vs natural object

radiator and natural object both are nouns.

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

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

radiator (noun)	natural object (noun)
a mechanism consisting of a metal honeycomb through which hot fluids circulate; heat is transferred from the fluid through the honeycomb to the airstream that is created either by the motion of the vehicle or by a fan	an object occurring naturally; not made by man
heater consisting of a series of pipes for circulating steam or hot water to heat rooms or buildings
any object that radiates energy