In SEO copywriting, saying the right thing can make a world of difference.
This is true in all forms of writing, but is most critical when writing your marketing content. It is especially critical when writing for the web, because you are working to appeal to human readership as well as search engines.
I was treated to a wonderful video on the web that illustrates the powerful meaning of words. The video at the following link is five minutes long. I don't think you will find the time wasted; check it out.