Fluoride is a compound. Its common form is calcium-fluoride.
Fluorine is an element. It is highly toxic. It combines readily with all elements except a couple of noble gases (as I recall). If nothing else nearby, fluorine combines with itself creating a fluoride (F2).
Look at this wonderful Periodic Table of Elements (in color; interactive; vivid historic photographs; wonderful narratives)
Disclaimer: Mark Twain (1835-1910-To be continued) is unlicensed. His river pilot's license went delinquent in 1862. Caution advised. Daily Paul ☑
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