Difference between 'write off' and 'write out'

[Joao Fonseca]

Hi dear friends, what would be the difference between
wirte off and write out ?
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Joao Mª H. Fonseca
Your last mistake is your best teacher.

[Skrej]

If you write off something, you deem it worthless, give up on it as a failure, or reduce the amount of something (particularly in taxes).

If you write out something, you express something in written words at length.
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[DiệpKh&#784]

For a better understanding, the following is some examples on write off & write out:
- Write off
+ Can I write this off as a deduction, or is it a dead loss? Can I write off this expense as a tax deduction?
+ We almost wrote off the investment as a dead loss.
- Write out:
+ Don't just write "7," write it out. Please write out all abbreviations, such as Doctor for Dr.
+ Let me write it out. Then I won't forget it. Karen wrote out her objections.
for your reading pleasure :).