If a name contains any such words then realize that the chances of losing potential traffic are significant. On the other hand, if an acronym makes a name easy to pronounce, easy to remember and shorter, then go for it. The shorter it is the better. Being the most popular suffix, its mnemonic value is as great as that of short domain names. Finally, the fifth guideline is to use repetition.
Repetitious sounds are pleasing to the ear and add a singsong quality to names.
These are called plosives. Many websites have two, three or even more names pointing to the same IP for increased visibility. It is unclear if this is true but hyphens can be used in this case to maximize search results. The added advantage is that keyword-based domains names often rank higher on most search engines. And think like your visitors and the keywords under which they will likely find your site.