botcher

1. One who mends or patches, esp. a tailor or cobbler. Shak.

2. A clumsy or careless workman; a bungler.

3. (Zoöl.) A young salmon; a grilse.

noun

A clumsy person: blunderer, bungler, dub, foozler. Slang screwup. Idioms: bull in a china shop. See ability/inability.

The noun has one meaning:

Meaning #1: someone who makes mistakes because of incompetence
  Synonyms: bungler, blunderer, fumbler, bumbler, stumbler, sad sack, butcher, fuckup