The best replacement for sea lion is seal.

The best alternatives to sea lion are rated as following:
★★★★★  seal
★★  walrus
★★  octopus
★  otter
★  sea otter
★  leopard seal
★  orca
★  manatee
★  penguin
★  elephant seal
  seals
  fur seal
  killer whale
  sea leopard
  harbor seal
  sea lion

Your alternative for sea lion is not listed? Suggest!
Speaking about sea lion, one probably shouldn't forget about killer whales.

Other search terms related to sea lion and their ratings are:
★★★★★ killer whales
You have in mind a companion for sea lion and it is not yet here? Propose!



Google Trends

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sea lion
seal
walrus