Flowerhorn is a catch all name for all CA hybrids. It's a design fish with the goal to accentuate certain desirable traits such as big hump, high body, and strong color particularly red. There are many designer hybrid African and SA cichlids in the trade, such as OB peacock, Fire Red peacock and fancy discus, but they won't be called FH. FH is an honest name as buyers know they are not pure species. On the other hand, many domesticated fish with pure species names are actually hybrids.
Mixed race human are hybrid according to purists standard. There are more morphological differences between races than say mixing different type of peacock.