Adverbial-- This, I then presume, is meant to describe the modifier of a verb or adjective: Humpty was suddenly pushed from behind and fell off the very high wall.
Participial-- And this, then, would be a participle acting as an adjective: The falling egg broke easily upon impact.
You are likely to receive other opinions, however; some of these grammar terms are slippery.
People are waiting to help.
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