Many of the above are wrong.
For example, while kneeled and dwelled exist in Am. English, they are by far the lesser noted shape … knelt and dwelt are much, much more common. One cannot go by the past tense with ‘t’ ending means BrE that is far too simplistic and often wrong.
Bogeyman rather boogeyman is more common in AmE and often said with a long o … like boe … in the military the word is ‘bogey’ with a long o.
The ‘s’ adverbs like ‘backwards’ is often found in AmEng.
Arse and ass are two different words … not different spellings.