It depends a bit on context. In a sentence where you ask about someone's technical capacities like: 'are you able to operate this", a synonym could be 'are you capable of operating this'. In a more general sense, you would replace 'are you able to...' simply with: 'can you....'.
a synonym for motive is not being able to do exercise
Was able to.
Apt.
Able is an example.
blind
qualified worthy desired
Inviting.
Adept is a synonym for highly skilled. Able is another synonym for highly skilled.
Synonyms for the word 'can' are able or container.
skillful, nimble, practiced, able, dexterous
able, accomplished, adaptable, adroit, all-around
There are no synonyms for multipurpose, it just means able to be used for several purposes.