As an adjective, 'away' is less common but can be used to describe something that is absent, distant, or reserved for future use.
He is away on business.
The away team lost the match.
I put some money away for a rainy day.
When used as an adjective, 'away' usually appears after the verb 'to be' (is, am, are, was, were) or similar linking verbs. Don't confuse the adverbial and adjectival uses of 'away.' Context will usually make it clear which is intended.
as an adverb, 'away' is used to indicate movement from a particular place, or to indicate distance or separation. It can also signify the passage of time or the disappearance of something.
She walked away without saying goodbye.
The store is just a mile away.
The deadline is two weeks away.
The stain washed away easily.
When used as an adverb, 'away' often follows a verb to create a phrasal verb, like 'throw away' or 'walk away.' 'Away' can sometimes be used metaphorically, as in 'dreaming the day away.'