We don't have synonyms for bandgap yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are band gap.
(n) :
(physics) The energy difference between two allowed ranges of electron energy in a solid; especially the difference between the energies of the valence band and the conduction band.
(n) :
(physics) A gap in a frequency range in which waves cannot propagate.
(n) :
(physics) The energy difference between two allowed ranges of electron energy in a solid; especially the difference between the energies of the valence band and the conduction band.
(n) :
(physics) A gap in a frequency range in which waves cannot propagate.