A reuben has corned beef and sauerkraut, there is something called a rachel sandwich which matches the sloppy joe better as it has coleslaw and either turkey or pastrami.
We’ve had some great discussions on this theme in the past:
http://talk.collegeconfidential.com/parent-cafe/1513133-funny-maps-of-how-we-speak-p1.html
There used to be a quiz going around that could determine what part of the country you were from by how you pronounced various words, and what terms you used for certain things. One of the main questions was how many different ways you pronounced Mary, merry, and marry - one,two or three?
And there are a LOT of regional variations! https://www.washingtonpost.com/blogs/govbeat/wp/2013/12/02/what-dialect-to-do-you-speak-a-map-of-american-english/
A Reuben has corned beef, Swiss cheese, sauerkraut. And depending on where you live, it might also have thousand island dressing. Some places don’t put any dressing on…and you use mustard.
I don’t think it’s a Reuben without that Swiss cheese.
Oh, no. Whenever I’ve seen this come up online, it always ends in blows 
A sloppy joe is different from a reuben. I’ve also never had a sloppy joe with pastrami. Here’s some more info and a picture of a sloppy joe. Millburn Deli makes the best ones!
https://thetakeout.com/new-jersey-sloppy-joe-1830658410
From SC. Barbecue is a noun, mostly pork slowly smoked. If you are having burgers or hotdogs on the grill, then you are having a cookout or grilling. If you are invited to a BBQ you will be having smoked meat. Coke is generic for all soft drinks although now mostly ask for soft drink but never pop or soda.
Barbeque is a noun in CT too, but here it means to outdoor grill. For Southern BBQ we’ll say smoke.
And I’m on line too. And Jersey Barrier too.
Yeah, I have somebody to stand on line with!
Aren’t we all online here? 
Regional differences can almost get one in trouble. D, who was raised in New England, where a liquor store (aka package store) is nicknamed a “packie”. She used that term while chatting with friends at school. Another girl overheard my daughter, got in her face and became enraged. Seems the other girl was Pakistani and thought she was using “Packie” as a slur. She refused to accept D’s explanation and fortunately the other girl walked away. Let’s just say that there is one regional term that is no longer in D’s vocabulary.
The use of jimmies vs sprinkles is also being curtailed locally as some question it’s etymology being racially charged.
What a buzzkill. Of course someone is offended. Sigh…
I grew up in Asia as the child of parents from New England, went to undergrad in central Massachusetts, did research in Philly and in Brooklyn, and I now live in Maryland. My boyfriend is from New Jersey. I’ve picked up words and phrases from all of those places so I have what I’d call a mixed Northeastern/Mid-Atlantic twang. I say “on line” because “Are you on line?” is probably the most frequently spoken phrase in New York City (it is two words–on line, not online, which means on the internet), but I also call it a rotary, not a traffic circle. Oh, the daycare I went to as an infant was run by two British women so I say “bin” or “trash bin”. I do say “drinking fountain” rather than bubbler (central Mass) or water fountain to avoid controversy. Not sure if this counts as “regional” between us my boyfriend and I speak three languages fluently (the foreign language I speak fluently, he is learning and vice versa) and often use common phrases from several languages to communicate–you’ll never hear “thank you” or “sorry” unless it’s something really serious, instead it’ll be “danke” and “lo siento”.
A rotary or traffic circle is a roundabout here. Northern New England, but I don’t know if it’s regional or more local than that.
This is a great thread! Thank you OP!
Gives me an idea for a spin off ; )
In Swahili a roundabout is a keepy-lefty. (They also drive on the British side of the road.)
When I lived in Phladelphia I was tickled to hear the expression “youz guys” which is the plural of “you guys”. I don’t know where else in the country this is used, but I only heard it in the Phillie area. Now that we live in “the South” (sort of) I am frequently told to “have a blessed day” which I find totally charming, nicer than the cliched, trite, “have a nice day”.
In Pittsburgh it’s “Yinz” for you guys, Gum Band for rubber band, Slippy for slippery and Nebby for nosy.
My favorite was at my last job when a male lawyer/coworker who was raised in the Pacific Northwest didn’t know what hoo-ha typically meant in the South and teasingly called one of the female paralegals that word meaning “you are being silly.” We all had a good laugh and she explained to him that you don’t call a Southern woman a hoo-ha. He said, “Why? What does it mean?” She said, “Well, you don’t have one!”
I have noticed that in the Pacific Northwest they say “spendy” to mean expensive. Here in southern California the equivalent is “pricey.” I’ve never heard spendy said anywhere south or east of the Oregon border.