据我所知,有三个:
excition, 名词,激励,激子。 这个词 日常较少用,通常用其他近义词,例如 stimulation / motivation / encouragement / incentive.
exciting, 形容词,令人兴奋的。通常形容事物,例如 an exciting story / book / journey / film, etc.
excited, 形容词,感到兴奋的。形容人或动物 感到兴奋,例如,She is excited about the coming sex. The dog was very excited when he met his owner after one month's separation.