What does
ninja
mean in Wordle 644?

1. An adult male human.

“The show is especially popular with middle-aged men.”

2. A person trained in ninjutsu, especially one used for espionage, assassination, and other tasks requiring stealth during Japan's shogunate period.

3. To act or move like a ninja, particularly with regard to a combination of speed, power, and stealth.

4. Of or related to ninjas in their various senses.

5. To appropriate something (before someone else does).