What's the difference between coucher and cougher?

Coucher

Definition:

(n.) One who couches.
(n.) One who couches paper.
(n.) A factor or agent resident in a country for traffic.
(n.) The book in which a corporation or other body registers its particular acts.

Example Sentences:

(1) There is a saying in France: l’information s’arrête à la porte de la chambre à coucher – information stops at the bedroom door.
(2) Iain Coucher, Network Rail chief executive, said: "Passengers care most about trains being on time and we have delivered another record year with punctuality surpassing 91%.
(3) Coucher added that the company could therefore charge lower track access charges to train operators, maintaining downward pressure on fares.
(4) In 2009 Network Rail's chief executive, Iain Coucher, waived his £300,000 annual bonus but three colleagues received a combined windfall of nearly £800,000.
(5) He added: "Punctuality is down to the private train operators who actually run the trains and it should not be used by Mr Coucher to try and prop up a flawed bonus system which is wholly unacceptable for running what is a state monopoly."

Definition:

Example Sentences:

(1) The laboratory findings of the cough sufferers--such as eosinophil percent in venous blood, serum GOT and GPT, urea nitrogen, creatinine, renal function (PSP excretion test and creatinine clearance), and pulmonary function (%FVC, FEV1.0% and %V25)--were not significantly different from those of the non-coughers.
(2) From 50% to 90% of chronic coughers may have hyperreactive airways.
(3) There were nine coughers and eight noncoughers in the study.
(4) Among the nine coughers, eight demonstrated bronchial hyperreactivity.
(5) Eight of the nine coughers were rechallenged two to six months following cessation of ACE inhibitor therapy.