Chaucer uses clever word choices to criticize actions of middle and lower classes in prologue
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Chaucer used words that were common to different social classes at the time. Bawdy humour and slang belonging to lower classes fit a particular tale. The Knight might use better English than say the Wife of Bath. This is a pretty big topic as word choice drives much of this poem. I'd take a look at the GradeSaver site for more.