What is Cherry Blossom in Japanese?

Senbonzakura

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This is not correct. Cherry blossom would simply be "Sakura" (桜) in Japanese conversation.

The above "senbonzakura" would seem to be 千本桜 (thousand cherry blossoms) which I have no idea what that's supposed to mean in this context. A quick google search shows that it's the name of some anime character's sWord, so there you go.