not submiting form if containing www. or http:// preventing spam

I want a website to have a form that DOES NOT use captha but I get alot of spam.

I want to use a couple of methods that will not deter the user. My methods are

honeypot technique(hidden form)

and not submitting form if contain certain words.

I want to use is a hidden field that if a spam bot fills out it will  disregard the form the spam bot will think the form was submited but it will actually disappear into the abyss .

if the form contains www. or .com or http:// or armani,Pharmacy,Viagra... you get the idea . it will not submit the form but will still take you to the thank you page