different between sunbow vs unbow

English

From sun +? bow. Compare rainbow.

sunbow (plural sunbows)

A bow or arc of prismatic colors like a rainbow, caused by refraction through a spray of water from a cataract, waterfall, fountain, etc., rather than through droplets of rain.

un- +? bow

unbow (third-person singular simple present unbows, present participle unbowing, simple past and past participle unbowed)

To unbend.
- 1639, Thomas Fuller, The Historie of the Holy Warre
  He […] would unbow his resolution

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