spallation vs nuclear reaction

spallation and nuclear reaction both are nouns.

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

As nouns, nuclear reaction is a hypernym of spallation; that is, nuclear reaction is a word with a broader meaning than spallation:

spallation: (physics) a nuclear reaction in which a bombarded nucleus breaks up into many particles
nuclear reaction: (physics) a process that alters the energy or structure or composition of atomic nuclei

spallation (noun)	nuclear reaction (noun)
(physics) a nuclear reaction in which a bombarded nucleus breaks up into many particles	(physics) a process that alters the energy or structure or composition of atomic nuclei