I have done many posts on keyword research at Search Engine Journal and figured it’s time to compile all the keyword research tools into one post for further reference.

1. Start with general reference sources and dictionaries.

Here are just a few of them, for more please refer to the original post: Keyword Research : Where to Start?

The free dictionaryWord definition(s), set phrases/ idioms (use them to lighten up your writing style), examples of usage. Words of the same root (inflected words and derivations), thesaurus, classic literature mentions, keyword phrases, related acronyms.
Synonym.comWord synonyms and antonyms.
Meta GlossaryWord definitions, related words and synonyms.
Reference.comYour core term synonyms and definitions.

2. Investigate your competitors’ keywords.

3. Use social media sites to analyze which words real people are using to tag your industry related content:

Features/ToolsTwitter SearchDel.icio.us related terms Facebook Lexicon
Data sourceTwitterDel.icio.usFacebook
How to use it.See your term in live context.See your term related tags.See how often your term is mentioned across FB walls.

Use more Twitter keyword research tools that allow to investigate hot trends and any term popularity:


4. Search blogs and news articles for more keyword ideas. Check out your niche meme trackers.

5. Use free keyword suggestion tools:

6. Check out keyword brainstorming tools (term clustering and related terms):

Tools/FeaturesWhat you will find there
Google SetsRelated terms (i.e. terms that are likely to appear in lists).
MSN clustering toolWord clusters (keyword phrases).
SearchradarTag clouds and keyword definitions.
Keyword MapRelated terms (synonyms and keyword phrases).
Urban DictionaryRelated terms (related synonyms and urban words).

7. Use your internal analytics reports to get an idea of your visitors’ preferences: here is a huge collection of Google Analytics advanced tips that can help you to do that.

8. More keyword related tools and resources: