nuclear fusion reaction vs nuclear fusion

nuclear fusion reaction and nuclear fusion both are nouns.

Word	Noun	Adjective	Verb	Adverb
nuclear fusion reaction	Yes	No	No	No
nuclear fusion	Yes	No	No	No

As nouns, nuclear fusion reaction and nuclear fusion are synonyms defined as:

nuclear fusion reaction and nuclear fusion: a nuclear reaction in which nuclei combine to form more massive nuclei with the simultaneous release of energy

Other synonyms of nuclear fusion reaction include fusion.

nuclear fusion reaction (noun)	nuclear fusion (noun)
a nuclear reaction in which nuclei combine to form more massive nuclei with the simultaneous release of energy	a nuclear reaction in which nuclei combine to form more massive nuclei with the simultaneous release of energy