Right or wrong, I've heard that a domain and website can potentially contain up to (2) main central, yet different themes, and still be treated favorable by the engines.

My question is how are added acronyms treated?
Ex: foodstoragebn.com

Where 'bn' relays probably something the search engines never pick up on. Maybe 'Buyers Network' spelled on the site page.

Eliminating an extensive character domain while maintaining keyword richness.