Synonyms for Operable (same or very similar meaning)
WordNet sense 1 (fit or ready for use or service):
functional, operational, usable, useableWordNet sense 2 (ready for service or able to give long service):
serviceableWordNet sense 3 (usable for a specific purpose):
practicableWordNet sense 4 (concerned with actual use or practice):
practicalFrom the ODE community, based on WordNetadd/edit