| bluebonnet | (noun) a brimless dark blue Scottish cap with a flat top and a plume on one side | Synonyms: Balmoral |
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| (noun) low-growing annual herb of southwestern United States (Texas) having silky foliage and blue flowers; a leading cause of livestock poisoning in the southwestern United States | Synonyms: buffalo clover, Lupinus subcarnosus, Texas bluebonnet |
| bonnet | (noun) a hat tied under the chin | Synonyms: poke bonnet |
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| (noun) protective covering consisting of a metal part that covers the engine | Synonyms: cowl, cowling, hood |
| bonnethead | (noun) small harmless hammerhead having a spade-shaped head; abundant in bays and estuaries | Synonyms: bonnet shark, shovelhead, Sphyrna tiburo |
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| sunbonnet | (noun) a large bonnet that shades the face; worn by girls and women | - |
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