different between flattener vs fattener

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.

fatten +? -er

fattener (plural fatteners)

One who fattens.
- 1840, John Armstrong, Jesse Buel, A Treatise on Agriculture, page 129:
  It rarely happens that the breeders of cattle are the fatteners of them.

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