As nouns the difference between bumph and sumph
is that bumph is while sumph is (scotland|northern england) a dunce; a blockhead.
sumph
English
Noun
(
en noun)
(Scotland, northern England) A dunce; a blockhead.
*1933 , (Lewis Grassic Gibbon), Cloud Howe'', Polygon 2006 (''A Scots Quair ), p. 312:
*:His daughter, that sumph that was Mistress Bruce, fair jumped as she heard the bang of the door [...].