The best replacement for grin is smile.

The best alternatives to grin are rated as following:
★★★★★  smile
★★★★  laugh
★★  smirk
★  laugh while watching this
★  glaswegian smile
  giggle

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

Other search terms related to grin and their ratings are:
★★★★★ cat
★★★ cat alice in wonderland
★ cat chris marker
cat marker
You have in mind a companion for grin and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of grin in all years. Click on graph for more.
grin
smile
laugh