Choose the letters that you want the words to contain and whether it's together or apart and you will see all the Russian words that fit the criteria. 

So if you put ба and "letters together" there are over 8000 words like аба, антибакхий etc. 

If you put ктер and "letters separately" you would get thousands of words like аккредитующий, аккуратное etc

The first column is the word, the second column is whether it's singular or plural and third column is the gender. Separately, we have other tools for finding Russian anagrams, Russian words that end with, Russian words that start with, Russian words by final letter, and loads of learn Russian tools.