What is another word for "instrument"?

Roget's Thesaurus (1911) lists these synonyms for "instrument": abysmal, accoucheur, accoucheuse, accubation, accumbent, agency, aid, all, alluvial, along, and, ankle, area, assistance, azimuth, back, bathometer, bathymetry, beam, benthal, beyond, billiard, bottomless, bowling, butte, calm, cast, cloud, cloudiness, cloudy, concavity, conducive, couch, couchant, crater, cricket, crook, croquet, dead, decumbence.