Are there any words with the same letter repeated three times in a row.?

Actually a number of English words have three of the same letter in sequence. The Oxford English Dictionary contains several:

Aaadonta - A type of snail. http://en.wikipedia.org/wiki/Aaadonta

Cavaticovelia aaa (a Hawaiian water bug) - http://en.wikipedia.org/wiki/Cavaticovelia_aaa

Goddessship

Headmistressship

Willless

Bulllike

Frillless

Offfall

You can even have "offfalllike" and there's the archaic "agreeeth" (third person singular present tense of the verb to agree). The word "tweeer" (comparative adjective of the qualifier twee meaning infantilely kitsch) and even things like "cryptooology" (if "cryptozoology" is the study of hidden animals and "oology" is the study of eggs then "cryptooology" would be the study of hidden eggs).

There are also many possessives ending in ss's such as in the word "actress's".

Not forgetting place names such "Rossshire" and "Invernessshire" (both in Scotland), The Welsh town "Llanfairpwllgwyngyllgogerychwyrndrob

wllllantysiliogogogoch" which contains the letter l four times in a row (though technically 2 Welsh digraph in a row) and "Kaʻaʻawa" in Hawaii.

And none of this is even taking into account the numerous words that contain 3 letters in a row which can be hyphenated!

There are hyphenated terms like cross-section and off-flavor, but as for being a single word, I'm not positive of any (that exist in modern standard English anyway).

No. That would be incorrect in the English language.

lol, there's a user in YA called Vsssarma if that helps.

other than kashyyyk from star wars, i got nothing

"There are not enough o's to make this smooth" Col Potter

no....