Forgot to put in both. You can say both in the comment.

No. Ninja is about assassination and stealth and stuff like that while Martial Artist is broader and doesn't focus on those particular skills/arts

OK.

If ninja not kill with one shot then they need martial arts to solve it more energy exhausted way.

That is agreeable

Being a Ninja is a job and martial arts is fighting styles.

Hmm. True, true.

Ninjas have fighting katas like all martial arts but their hope is to kill before having to resort to fighting. They do have an extensive list of weapon mastery.