ayasa
āyāsa — of endeavor; SB 6.11.23
ayasa — iron; SB 8.2.2-3
tulya-āyāsa-hetavaḥ — who made an equal endeavor; SB 8.8.39-40
āyasa-kīla-śṛńkhalaiḥ — strongly constructed with iron pins and closed with iron chains; SB 10.3.47
tat-rodhana-āyāsa — of their attempt to stop the cows from going to their calves; SB 10.13.32
āyāsa — of endeavor; SB 11.23.10