IPA: /ˈæl.əˌɡræf/
KK: /ˈæl.əˌɡrɑːf/
A letter or group of letters that can represent the same sound in different forms, like how 'f' and 'gh' can both make the /f/ sound. It can also refer to different shapes of a letter or a signature written by one person for another.
In the word 'enough', the letters 'gh' serve as an allograph for the phoneme /f/.
Allograph → It is formed from "allo-" (from Greek "allos", meaning other or different) and "graph" (from Greek "grapho", meaning to write). The word "allograph" refers to a different form of writing or representation, particularly in the context of signatures or handwriting.
Think of 'other' ('allo-') forms of 'writing' ('graph') — that's why an allograph refers to a different way of writing.