Keyword Research Tools
Here are a few tools for looking for keywords and phrases.
Google
https://adwords.google.com/select/KeywordToolExternal
WordTracker
http://www.wordtracker.com
Keyword Discovery (Trellian)
http://www.keyworddiscovery.com
http://www.keyworddiscovery.com/search.html
Dictionary
http://www.dictionary.com
Thesaurus
http://www.thesaurus.com
Acronym
http://www.acronymfinder.com