different between shortnessofbreath vs breathless

English

From breath +? -less.

breathless (comparative more breathless, superlative most breathless)

Having difficulty breathing; gasping.
That makes one hold one's breath (with excitement etc.).
- 1934, Frank Richards, The Magnet, The Mystery of the Vaults
  The plane buzzed on at a breathless speed. Bob had been in a plane before, and he had no fear. Indeed, but for the strange circumstances, he would have enjoyed that breathless rush through space.
Not breathing; dead or apparently so.
Having no wind; still, calm or airless.
Having a somewhat hysterical tone, using over-emotive language.

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