This reflects the survival of old plural forms (ox, oxen), historical sound changes in Old English words (foot, feet), and loan words adopting “s” as a plural (vows). Broadly, there were reformers who wanted to spell words according to the way they were pronounced and traditionalists who wanted to spell them in one of the ways they always had been. There was another party, however. We could call them the Tamperers. In a desire to make the roots of the language more evident and perhaps give it more style, more class, some words that had entered English from French were later given a Latin look.
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