different between sixpence vs eightpence

English

From six +? pence.

sixpence (countable and uncountable, plural sixpences)

(obsolete, Britain, uncountable) The value of six old pence; half of a shilling; or one-fortieth of a pound sterling.
(historical) A former British coin worth sixpence, first minted in 1551.
- 1994, Neil Gaiman, Mr. Punch:

tanner (colloquial)
lord, tester, tizzy, hog, sow's baby (each being slang and dated, archaic, or obsolete)

eight +? pence

eightpence (plural eightpences)

(historical, numismatics) A former coin worth eight pence; the monetary amount of eight pence.

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