As nouns the difference between tump and tums
is that
tump is (british|rare) a mound or hillock or
tump can be (uncommon) a tumpline while
tums is .
As a verb tump
is to form a mass of earth or a hillock about or
tump can be (southern us) to bump, knock (usually used with "over", possibly a combination of "tip" and "dump").