Answer:
野 YA, no - field, plain
籠 ROU, kago, ko(moru) - basket
鎧 KAI,GAI, yoro(i) - armour
闘 TOU, tataka(u) - fight, struggle
氷 HYOU, kouri, hi, kou(ru) - ice, freeze
They are all used with 球 (KYUU, tama - ball, sphere) in the names of ball sports.
野球 YAKYUU - baseball
籠球 ROUKYUU - basketball
鎧球 GAIKYUU - american football
闘球 TOUKYUU - rugby
氷球 HYOUKYUU - ice hockey