So although there are no official lists of words that search engines use for filtering inappropriate
keywords, you can figure out some guidelines for yourself. Two types of words have the potential

to create issues for your site if you use them as keywords within the site or for PPC marketing
purposes:

• Vulgar words

• Politically incorrect words (these words are especially dangerous in countries like China

and North Korea where censorship is prominent).

Despite what seems like a simple list for types of words to avoid, it’s really not that simple. Many
words can be excluded or even flagged by a search engine because those words are associated with
search engine spam. When it becomes apparent that a word or term seems to be used strictly to
rank highly, even when included on a page full of unrelated content or links, search engines will
flag that word or phrase and will consider closely the relationship to other words and links on a
page before making a ranking determination. The problem with that, however, is that as soon as
search engines crack down on a word or phrase, another one pops up to take over.
Now, don’t confuse poison words with keyword poison. Keyword poison is actually the use of keywords
on your site far too many times. When you’re including keywords on your site, you should
use them only as often as necessary and not one time more than that. If you throw your keywords
into the site randomly, you’re poisoning the search term ranks and run the risk of having your site
knocked farther down in the ranking or even having it delisted completely as spam.
Finally, forbidden search terms and poison words are different from stop words. Stop words are those
words that are so common on the Web that they are usually ignored by search engines and are completely
useless in your PPC programs and other keyword marketing efforts. Here’s a brief list of some
of the most common stop words, though there are dozens more that might be included:

•  A

• An

•  The

• But

• E-mail

• When

• Where

• How

• Free

• If

• While

• Or 

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