Plates and plaits are easily confused words.
The spell-check application of most word processing software programs would not catch a slip-up of these two words. Spell-check is looking for words that aren’t in its dictionary, and words that resemble words in its dictionary but are possibly spelled wrong. Spell-check isn’t perfect. It doesn’t know and can’t guess what word you wanted or what word you meant, it can only judge the words on the page. If you used words that are all spelled correctly, it gives you a pass anyway. Similarly, autocorrect on mobile phones might suggest one word instead of the other, it would be easy to do since both words start with “p-l-a.”
Plates (pronounced “playts”) is the plural form of the noun plate. It means the flat, 6-9 inch serving pieces that people eat off of at a sit-down meal. Plates can be made of a number of materials, i.e., baked clay or porcelain, styrofoam, plastic, or paper. Typically, the more fragile plates are used for formal dinners and special occasions like Easter, Thanksgiving, and Christmas. Disposable or recyclable plates are used for casual dining, cookouts, and outdoor picnics.
Plaits (US: “playts”/”platts”; UK: “platts”; ) is a noun. It is means hair or straw sections woven into braids.
The following sentence uses both words correctly:
Mother didn’t want Pleiade touching the silverware or the plates until she’d cleaned up a bit. “Please wash your face, put your unruly hair in plaits, and brush your teeth. Then come back and help me, Pleiade.”