An unmentioned subcategory is words that that sound or look like taboo words, but are actually unrelated: "niggardly", "Gaylord", "fag" as in cigarette (from "fag end", unrelated to "faggot"), etc.
Yes, but this appears to be the origin of the pejorative: bundle of sticks -> an old woman collecting sticks -> a man who acts like an old woman -> homosexual.