The best replacement for supernova is nova.

The best alternatives to supernova are rated as following:
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★★★★★  870
★★★  black hole
★★★  887
★★★  bps
★★  remington 870
★★  supernova
★★  gamma ray burst
★  polaris
★  nova pump
★  white dwarf
★  590
★  mossberg 500
★  870 express
★  hypernova
★  planetary nebula
★  browning bps
★  super nova
★  remington 887
  winchester sxp
  ultranova
  nebula
  black card
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  nova benelli
  mossberg 835
  benelli nova
  stoeger m3500
  mossberg 590
  supernovae
  edelux

Your alternative for supernova is not listed? Suggest!
Speaking about supernova, one probably shouldn't forget about lukas rossi.

Other search terms related to supernova and their ratings are:
★★★★★ lukas rossi
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★ toby rand
★ lukas
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