The following are the ten words, or root words, which occur most often in Lovecraft’s original writings:
Hideous – 260
Faint (ed/ing) – 189
Nameless – 157
Antiqu (e/arian) – 128
Singular (ly) – 115
Madness – 115
Abnormal – 94
Blasphem (y/ous) – 92
Accursed – 76
Loath (ing/some) – 71
Via
https://arkhamarchivist.com/wordcount-lovecraft-favorite-words/