The best replacement for grout is caulk.

The best alternatives to grout are rated as following:
★★★★★  caulk
★★★★★  mortar
★★  unsanded grout
★★  non sanded grout
★★  no grout
★  caulk first
★  caulk shower corners
★  silicone
★  regular grout
★  cement
★  caulk shower
★  thinset
★  epoxy
★  caulk tile corners
  caulk bathtub
  sanded grout
  caulk shower floor
  mortar masonry
  slurry
  unsanded
  plaster
  caulk tub
  epoxy grout
  cement grout
  non sand grout
  calk
  standard grout
  caulk corners
  non sanded
  caulk shower drain
  caulk shower tile
  sand grout
  white cement
  grout

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

Other search terms related to grout and their ratings are:
★★★★★ sealer
★ tile
★ glass tile
★ damaging tiles
★ vinyl tiles
vinyl floor tiles
damaging tile
sealer in it for porcelain tile
chipping tile
white subway tile
scratching tile
marble tile
You have in mind a companion for grout and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of grout in all years. Click on graph for more.
grout
caulk
mortar