Yes, AX is a valid Scrabble word!
a tool used for chopping wood, typically of iron with a steel edge and wooden handle
Synonyms: hatchet, cleaver
a musical instrument played in rock music or jazz, especially a guitar or (originally) a saxophone
end, cancel, or dismiss suddenly and ruthlessly
Synonyms: cancel, withdraw, drop, abandon, end, terminate, put an end to, discontinue, dismiss, give someone notice