We don't have synonyms for protons yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are proton, photons and crotons.
(n) :
(particle physics) A positively charged subatomic particle forming part of the nucleus of an atom and determining the atomic number of an element, composed of two up quarks and a down quark.
(n) :
(particle physics) A positively charged subatomic particle forming part of the nucleus of an atom and determining the atomic number of an element, composed of two up quarks and a down quark.