Definition
“Big-bud hickory” isn't a universally recognized term, but likely refers to a hickory tree (possibly the Bitternut Hickory, Carya cordiformis) known for its relatively large winter buds. These buds are noticeably larger than those of other hickory species. So the nickname refers to a key identifier. The large buds are visible even in winter. These provide a quick way to identify it. It’s like calling someone 'Big Head' – you notice the prominent feature.