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[–]MarkTwainiac 4 insightful - 1 fun4 insightful - 0 fun5 insightful - 1 fun -  (0 children)

Most words have multiple meanings. When the meanings are related, as in the case of sex and sexual, it's called polysemy. When the meanings and origins of the words are unrelated, it's called homonymy.

https://en.wikipedia.org/wiki/Polysemy

https://oxfordre.com/linguistics/view/10.1093/acrefore/9780199384655.001.0001/acrefore-9780199384655-e-325