The best replacement for oyster is clam.

The best alternatives to oyster are rated as following:
★★★★★  clam
★★★★  mussel
★★★  jubilee bracelet
★★★  travelcard
★★  scribd
★  scallop
★  jubilee
★  travelcard london
★  clams
★  oyster max
★  audible
  sola
  visitor oyster
  hoisin
  travel card
  travel card in london
  london pass
  super oyster
  season ticket
  datejust
  icandy peach
  clam mussels
  icandy
  hoisin sauce

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

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



Google Trends

Scale is based on the average worldwide traffic of oyster in all years. Click on graph for more.
oyster
clam
mussel