The best replacement for seal is sea lion.

The best alternatives to seal are rated as following:
★★★★★  sea lion
★★  marine
★★  seel
★★  green beret
★  ranger
★  no seal
★  expunge
★  walrus
★  swcc
★  delta force
★  delta
★  asphalt
★  pj
★  stain deck
★  israeli commando
  signet
  army ranger
  pararescue
  penguin
  spetsnaz
  stamp
  sea otter
  lap seal
  signature
  packing
  mermaid
  logo
  expunge florida
  killer whale
  bloom harvest
  chip seal
  gasket
  flex seal
  recon
  seal coating
  rustoleum
  otter
  bolted bonnet
  seal coat
  dynamat
  slurry seal
  stain a deck
  ported
  blue devil
  suction
  dry seal
  commando
  polar bear

Your alternative for seal is not listed? Suggest!
Speaking about seal, one probably shouldn't forget about heidi.

Other search terms related to seal and their ratings are:
★★★★★ heidi
★★ certificate
You have in mind a companion for seal and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of seal in all years. Click on graph for more.
seal
sea lion
marine