Keywords are heart to effective Internet searches. Whether optimizing a web site or searching for a hard-to-find item, consider tapping resources to locate a variety of keywords. Identify keywords and phrases that are relevant to products, services, or information you are promoting or searching for.
Synonyms Use a thesaurus to find terms that are related to a primary keyword. Searching on a synonym will often bring up different Internet search results. A thesaurus groups words that are similar in meaning. Usually, you reach for a thesaurus when you have a word in mind and you are looking for a similar term. Keep in mind that no two words mean exactly same thing. We turn to a thesaurus to find different, more expressive ways of speaking and writing, this is particularly important when related to keywords.
WebReference - http://thesaurus.reference.com/ Merriam-Webster - http://www.m-w.com
Singular and Plurals Using plural form of a word in many of search engines, may result in a different batch of search results, than a search using word's singular form. It is important that websites be optimized for both singular and plural forms of critically important keywords or phrases.
Meta Tags Look at competitor or similar web sites meta tags to determine if you have overlooked any obvious keywords or phrases. This is very easy to do, simply view source of web page and look for a tag in header that says [meta name="keywords" content=].
Conjugate Verbs Conjugating verbs in keyword phrases will also vary search results. Epitomize a variety of pages for critical past, future and present tense keyword phrases.