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Synonyms for Able (same or very similar meaning)

WordNet sense 1 (having a strong healthy body):
able-bodied

WordNet sense 2 (physically and mentally sound or healthy):
fit, healthy

WordNet sense 3 (properly or sufficiently qualified or capable or efficient):
competent

WordNet sense 4 ((usually followed by `of') having capacity or ability):
capable


From the ODE community, based on WordNetadd/edit