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You have to enter words, not full names or email addresses. Words contain only alphanumeric characters. Alphanumeric means a-z, 0-9 and international characters such as Latin characters with diacritics (e.g. ł, ü, è, oø, ...), Greek, Cyrillic, Hiragana, Katakana, etc. If you put a space or any symbol including but not limited to at-sign, dot, comma, underscore and so on they are no longer words and will be silently ignored. Remember, the feature is called "Anti-spam Bad Words", not "Anti-spam Bad Phrases, Pieces of Text or Content in General".

The problem with anti-spam phrases is that it takes way too long to process them. The processing is based on regular expressions which are notoriously slow when you cross word boundaries. We could do a simple full text search on input variables, but it's equally slow and even more unreliable. Just to give you an idea, blocking "Stupid Bot" won't work if the typed name is "Stupid Bot" (I used a non-breaking space instead of regular space) or "Stupid Bot" (two spaces instead of one). The devil lies in the details.

Now, regarding your problem. It all depends on the form target, that means how your form works. If the form is submitted to a Joomla! component (therefore Admin Tools' plugin runs on form submission) we can block the request. If, however, the form is submitted to a bespoke script then Admin Tools' plugin doesn't run and we don't have a chance of blocking the request. Some form components and most custom coded forms choose the latter method. In this case using custom made .htaccess Rules is your only option. These are tricky to write, I know, that's what led me to implementing the Bad Words feature.

> Is it possible that a plugin can be developed in which if the plugin can run on these independent forms, may be by adding a code so (forms which bypass by chossing the later method)

No. The explanation is a bit complicated and it takes a developer to understand it. Let me try rephrasing your request in a way that will help you understand immediately what is the problem: "Is it possible for a motorcycle to be developed in which if the road ends at the end of the cliff it can still keep on moving straight, maybe by adding wings, a rudder, a jet engine and a jet fuel tank (which the rider has to wear before mounting the motorcycle)". Yes, I could, but I don't think I should mainly for practical reasons. Instead of going through all that hassle, the developer can simply spent half an hour turning his bespoke script into a rudimentary Joomla! component.