Adverbs are, of course adverbials, but not all adverbials are adverbs.
Match the term in italics to the definition.
He left through that door.
He left by bus.
He left slowly.
He left last August.
He left at six o'clock.
He left because he need to catch a train.
He left when he saw me.
He left sobbing loudly.
He left to get his train.
He left earlier.
adverbial - prepositional time phrase
adverbial - infinitive of purpose
adverbial clause - reason
adverbial - non-finite (participial) clause
adverbial - noun time phrase
adverb - time
adverb - manner
adverbial - time clause
adverbial - prepositional manner phrase
adverbial prepositional place phrase