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1. shake roof - building material used as roofing

2. shake v. - to move suddenly from side to side .....

How come shake #1 and #2 have quite different meanings?

Thanks,
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Hundreds of homographs exist in English, MTL:

bear
right
lean
fair
gill

etc
etc
Comments  
1. shake roof -

A shake is a wooden shingle that is made from split logs. When these are used for covering the top of a house, the result is a shake roof.

2. to shake - to shake a thing or a person, movement.
 Mister Micawber's reply was promoted to an answer.