Adverb suffix

From Teflpedia

An adverb suffix is a suffix used to make an adverb.

In English, the main adverb suffix is -ly, but -wise can also be used (e.g. clockwise). For bare adverbs where there is no change from adverb-adjective, some grammarians would identify a zero suffix, (i.e. nothing).

-ally, -ably -ibly may appear to be adverb suffixes but they are actually -ly; added to an adjective suffix; al+ly and able+ly (-ible is a form of -able).

Wiktionary also lists -ling which is unusual[1]

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