Minecraft wiki entry for Development_versions, associated text: /ability – Because it is an Education Edition feature, it is not available in normal gameplay
/clearfixedinv – Version exclusive
/clone
/deop
/execute
/fill
/gamemode
/gamerule
/give
/help (with alias /?)
/kill
/list
/op
/say
/setblock
/setfixedinvslot – Version exclusive
/setworldspawn
/spawnpoint
/summon
/tell (with aliases /msg, /w)
/testforblocks
/time
/toggledownfall
/tp (with alias /teleport)
/testforblock
/weather
/wsserver – Version exclusive
/xp