While the pair "abduct-abductor" can be used in the muscular sense in Portuguese -{01449427-v abduct, abduzir -pull away from the body; "this muscle abducts"}, it seems more commonly used in its kidnapping sense, {01471043-v snatch, kidnap, abduct, nobble, abduzir, sequestrar, raptar -take away to an undisclosed location against their will and usually in order to extract a ransom; "The industrialist's son was kidnapped"}, where the role would be agent.
looking up the pair "dilate-dilator", we see one of the first applications of the work morphosemantic links do for us.