My favorite word has to be E-L-D-R-I-T-C-H, although a lot of people favour inchoate, if only for the way it rolls off the tongue. Eldritch has to be THE Lovecraft Word, since most genre authors pick up the usage of the term from Mythos works. Lovecraft has done more to popularize the word in the 20th century than everyone else put together, without question.