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FFA -

'Free for All' link exchange sites. Usually denotes a page where a link can be added by anyone. Should be avoided at all cost as search engines consider FFA sites as spam.

Filter Word (Stop Word) -

Common words that are ignored by search engines because it does not add to relevancy. Words such as 'the', 'it', 'a', and 'for' are considered stop words are ignored by many search engines.

Flash Page -

While being similar to a doorway page, the purpose of a flash page is more artistic - a grand entry way to a website. The use of a flash page is not good for effective search engine optimisation.

Frames -

This is an HTML technique which allows a webmaster to display two or more separate web pages within a single browser screen. Sites using frames are quite problematic for search engines to crawl and may not be indexed properly. Search engines often will only index pages linked within the <NOFRAMES> tag.