Use the drop down to select the number of letters. Then enter either a single character or a period (.) to indicate a missing letter in each box.

For example, '.', '.', 'w', '.' to search for a four-letter word where the third letter is w and the other letters are unknown.

Number of letters  


Solutions:


Word list from https://github.com/dwyl/english-words. The C source for the code to do the search is available here.