Chemical element and Fluorine

Chemical element noun - Any of the more than 100 known substances (of which 92 occur naturally) that cannot be separated into simpler substances and that singly or in combination constitute all matter.

Fluorine and chemical element are semantically related. In some cases you can replace term "Fluorine" with "Chemical element", this terms are similar.

Fluorine noun - A nonmetallic univalent element belonging to the halogens; usually a yellow irritating toxic flammable gas; a powerful oxidizing agent; recovered from fluorite or cryolite or fluorapatite.

Chemical element and fluorine are semantically related. You can use "Chemical element" instead a noun "Fluorine".