Good domain names are easy to remember
In fact, that is the primary quality of good domain names. The name aaa.com is therefore better than gzy.com.
Contrary to old thinking, it is not important that the domain name matches the activity of the site owners. If a company is involved in the international distribution of oceanographic radio sensors, it may still be better off with a website named yaga.com, rather thanoceanosensors.com. Find a meaning for yaga after you decided that it sounds good.
References:
1 C. Whan Park, Sandra Milberg, Robert Lawson, Evaluation of Brand Extensions: The Role of Product Feature Similarity and Brand Concept Consistency, Journal of Consumer Research Vol. 18, No. 2 (Sep., 1991), pp. 185-193
2 Jeffrey F. Durgee, Robert W. Stuart, Advertising symbols and brand names that best represent key product meaningsJournal of Consumer Marketing, ISSN: 0736-3761, Online from: 1984