SEO Chat has a great little article on using a little online tool called Wordnet to research keywords and optimize sites for Search Engines. It gets a little technical but is helpful if you persist with it and play around with the tool.
Basically Wordnet gives you synonyms and hypernyms of your keywords – as they’d be seen by Search Engines. Its a really nice tool that is worth checking out (although can take a little time to get your head around it and find ways to utilize it well)
Author ‘randfish’ finishes by explaining how he uses it in his SEO techniques:
‘1. Keyword Research- I want to check my terms in Wordnet to find related words, terms, etc. that searchers might use to find my site. It’s great for this and very simple….
2. On-Topic Site Architecture – The best sites for search engines start by describing a broad term and then going narrow. If you have a site about Real Estate, you can start with that topic, then have sub-topics about each hyponym and from each of those have their hyponyms….
3. On-Topic Links – You may not have realized how valuable a link from a type of site is. With real estate, for example, a link from a site on ‘property’ to the home page or a link from a page on ‘land’ to a deeper page is exactly the type of thing that would conceptually give you a SE on-topic boost….’