pair formation vs pair production

pair formation and pair production both are nouns.

Word	Noun	Adjective	Verb	Adverb
pair formation	Yes	No	No	No
pair production	Yes	No	No	No

As nouns, pair formation and pair production are synonyms defined as:

pair formation and pair production: the transformation of a gamma-ray photon into an electron and a positron when the photon passes close to an atomic nucleus

Other synonyms of pair formation include pair creation.

pair formation (noun)	pair production (noun)
the transformation of a gamma-ray photon into an electron and a positron when the photon passes close to an atomic nucleus	the transformation of a gamma-ray photon into an electron and a positron when the photon passes close to an atomic nucleus