The Dictionary of American Regional English
Like other dictionaries, the Dictionary of American Regional English (DARE) is arranged alphabetically by headword, from A to Z.
What is different about DARE is that it shows where people use the words that are included. We all know, for example, that Americans have many names for the kind of sandwich that includes meats, cheeses, lettuce, tomatoes, etc., served in a long bun.
What DARE can tell you (and can often illustrate through the use of maps based on fieldwork) is where the words hero, hoagie, grinder, sub, torpedo, Cuban, etc. are the local terms for this sandwich. It can also tell you where people use the words darning needle, ear cutter, eye stitcher, mosquito (or skeeter) hawk, sewing needle, snake doctor, or snake feeder (among other terms) for a dragonfly.