I can never remember where the BSD plaintext dictionary is (at least, on OSX). It is in /usr/share/dict in a file called “words”. This dictionary is incredibly useful, as you can do all the wonderful things you’d want via text processing tools available on Unix like systems. Want all words that contain “taco”? egrep 'taco' words Or perhaps all words ending with “ca”: egrep 'ca$' words

Just for completeness’s sake here’s the README in full:

#       $NetBSD: README,v 1.2 1997/03/26 07:14:32 mikel Exp $
#       @(#)README      8.1 (Berkeley) 6/5/93

WEB ---- (introduction provided by jaw@riacs) -------------------------

Welcome to web2 (Webster's Second International) all 234,936 words worth.
The 1934 copyright has elapsed, according to the supplier.  The
supplemental 'web2a' list contains hyphenated terms as well as assorted
noun and adverbial phrases.  The wordlist makes a dandy 'grep' victim.

     -- James A. Woods    {ihnp4,hplabs}!ames!jaw    (or jaw@riacs)