different between flattener vs flattened

English

From flatten +? -er

flattener (plural flatteners)

Anything that flattens.
(finance) A trade whose terms are based on the assumption that the rate of return will decrease.
- 2012, Howard Corb, Interest Rate Swaps and Other Derivatives (page 451)
  Provided that the curve doesn't ever flatten too much and the option remains out-of-the-money, then we will put on flatteners when the curve steepens and put on steepeners when the curve flattens.
- 2014, Greg Gliner, Global Macro Trading: Profiting in a New World Economy
  For example, if a trader thought that 2's 10's would trade lower than 185, he or she would put on a flattener.

flattened (comparative more flattened, superlative most flattened)

Made flat by something.
We removed the fallen tree from the flattened car.

flattened

simple past tense and past participle of flatten
The tree fell on the car and flattened it.

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