Van Allen radiation belt vs Van Allen belt

Van Allen radiation belt and Van Allen belt both are nouns.

Word	Noun	Adjective	Verb	Adverb
Van Allen radiation belt	Yes	No	No	No
Van Allen belt	Yes	No	No	No

As nouns, Van Allen radiation belt and Van Allen belt are synonyms defined as:

Van Allen radiation belt and Van Allen belt: a belt of charged particles (resulting from cosmic rays) above the Earth trapped by the Earth's magnetic field

Van Allen radiation belt (noun)	Van Allen belt (noun)
a belt of charged particles (resulting from cosmic rays) above the Earth trapped by the Earth's magnetic field	a belt of charged particles (resulting from cosmic rays) above the Earth trapped by the Earth's magnetic field