The best replacement for black widow is brown recluse.

The best alternatives to black widow are rated as following:
★★★★★  brown recluse
★★  tarantula
★★  scorpion
★★  brown widow
★  black widow ultimate
★  elektra
★  punisher
★  black canary
★  praying mantis
★  wolf spider
★  catwoman
★  batgirl
★  wasp
★  fire ants
  black cat
  lycosa
  daddy long legs
  no mercy
  7g
  mystique
  red back
  mockingbird
  yellow jacket
  rattlesnake
  cherchez la femme
  brown recluse spider
  g710
  javelin
  steelseries 6gv2
  false widow
  brown recluse bite
  k70
  valiant
  huntress
  brown recluse spiders
  pug
  baroness
  hawkeye
  black widow
  brown widow spider
  deathstalker

Your alternative for black widow is not listed? Suggest!
Speaking about black widow, one probably shouldn't forget about captain america.

Other search terms related to black widow and their ratings are:
★★★★★ captain america
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black widow
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