The best replacement for yams is sweet potatoes.

The best alternatives to yams are rated as following:
★★★★★  sweet potatoes
★★★  potatoes
★★  sweet potatoes nutrition
★★  sweet potato
★  sweet potatoes healthier
★  sweet potatoes difference
★  sweet potato nutrition
★  sweet potatoes cooking
★  potatoes nutrition
★  potatoes healthier
★  potato
  red potatoes
  sweet potatoes for fries
  cassava
  sweet potatoes paleo
  wild yams
  white potatoes
  candied sweet potatoes
  white potato
  yams
  sweet potatoes. com
  pumpkin

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

Other search terms related to yams and their ratings are:
★★★★★ marshmallows
marshmallow
brown sugar and pecans
You have in mind a companion for yams and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of yams in all years. Click on graph for more.
yams
sweet potatoes
potatoes