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 sobbing loudly.
He left because he need to catch a train.
He left when he saw me.
He left slowly.
He left by bus.
He left earlier.
He left last August.
He left at six o'clock.
He left to get his train.
adverbial - noun time phrase
adverbial - prepositional time phrase
adverbial - time clause
adverbial clause - reason
adverbial prepositional place phrase
adverbial - non-finite (participial) clause
adverb - time
adverbial - infinitive of purpose
adverb - manner
adverbial - prepositional manner phrase