dictionary word lists

every unix-based os has a dictionary word file 

$ wc  /usr/share/dict/words

  235886  235886 2493109 /usr/share/dict/words

online resources

https://github.com/dwyl/english-words

http://www.mit.edu/~ecprice/wordlist.10000

http://www.math.sjsu.edu/~foster/dictionary.txt

http://wordlist.sourceforge.net/