fester

rhymes with pester ... so if you pester someone they will get festered, meaning irritated.

fest+er...fest(fist)..hit somebody with your close fist until blood comes out and if it is left untreated it wil become a sore and than a pus..........

Some one keeps pestering you to go faster , faster , faster , faster, faster, faster... (see now ur angry ) ;)

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If you foster a sore, it will become fester.

sore pestered becomes festered

fester sounds like blister that oozes pus and causes irritation

fester ->wasted feast giving rotten smell, its look like pus in wound.