Interesting words in Russian Интересные слова русского языка
The longest word in Russian would be: "Тетрагидропиранилциклопентилтетрагидропиридопиридиновые". 55 letters. I bet 99.9% of Russian speakers won't know it, as it is some chemistry definition.
Another word would be "гиппопотомомонстросесквиппедалиофобия". 37 letters. Its Latin counterpart is "Hippopotomomonstrosesquippedaliophobia", and apparently means "the phobia of long words" :)
A word containing 6 consonants in a raw: контрстратегия (counter strategy). Yep, Slavic languages are known for their consonant blocks :)
Longest monosyllable word would be: вскользь (in passing, casually). That's 8 (!) letters for one syllable.
Two words containing a continuous sequence of 3 "е": длинношеее - long necked. змееед - snake eater.
Speaking of 3 letter sequence, there is a nice riddle: Какое слово начинается с 3 "г" и заканчивается на 3 "я" ? (which word starts with 3 "г" and ends with 3 "я"). The answer would be тригонометрия - trigonometry. Of course it helps to know that "три" is three, but hey, we're learning Russian here :)
And here is the Russian version of "The quick brown fox jumps over the lazy dog":
Съешь же ещё этих мягких французских булок да выпей чаю (Eat some more of these fresh French loafs and have some tea)
In case you wonder what is so special about "The quick brown fox..." - this sentence contains all the 26 letters of the Latin alphabet used in English. Similarly, the sentence above does the same for all the 33 letters of Russian Cyrillic.
Well, I can think of the even longer monosyllable word, but I'm not sure that one can find it in a dictionary. Neither I am sure that it is not obscene.
Well, I see now that it is in wiktionary. And it has "груб.-прост." all over it. So, I just give you the first 6 letters (all of which are consonants) and you decide for yourself, if it is worthy of being added to your list: