Translucent paper is see-through and is used for overlays.
Index paper is used for index cards and heavier weight paper uses.
Tag and Board is a heavy paper most often used for retail and industrial purposes such as hang-tags. Envelope paper is sent to companies that convert it into envelopes, usually standard commodity white. Forms bond is sent to companies that convert it into continuous forms. Carbonless is used for multiple impressions from a single top sheet.