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Why do some nouns have multiple genders listed? Include an example in your answer.
They refer to people (and sometimes animals) - if the person they refer to is feminine, then the noun is feminine; if the person they refer to is masculine, then the noun is masculine.
civis, civis, m/f
caupo, cauponis, m/f
hospes, hospitis, m/f
canis, canis, m/f
bos, bovis, m/f