The words file is a dictionary of English words for the /usr/dict directory. Programs like ispell use this database of words to check spelling.
-rw-r--r-- 1 root root 409286 fév 6 2004 /usr/share/dict/linux.words lrwxrwxrwx 1 root root 11 fév 6 2004 /usr/share/dict/words -> linux.words drwxr-xr-x 2 root root 0 fév 6 2004 /usr/share/doc/words-2 -rwxr-xr-x 1 root root 9851 mar 13 1993 /usr/share/doc/words-2/README.linux.words -rwxr--r-- 1 root root 1408 oct 10 1993 /usr/share/doc/words-2/README2.linux.words