He was a gentil harlot and a kynde;
A bettre felawe sholde men noght fynde.
The assonance of the “ah” syllable (in “a,” “harlot,” “and”) gives this couplet an air of pretentiousness, as if the speaker was not being truthful at all. The description is just the guise that the Summoner puts on, but it hides his true character. An additional sound is repeated use of the “awh” syllable, also as if the speaker was being fake but also condescending and deliberately ironic.
The assonance between the “eh” sounds in “bettre” and “felawe” (“better fellow”) link the words and draw attention to them—amusing since we know that the Summoner is not a good guy, so men definitely could “fynde” (“find”) “a better fellow”!
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