ar·du·um^[1]

Similar to arduum

• arduus – difficult, proudly elevated
• arbitrium – judgment
• armarium – chest, cupboard, safe
• arbitro – arbitrate, bear witness, judge, to witness
• arbitror – arbitrate, bear witness, judge, to witness
• arbor – tree
• arbustum – a vineyard planted with trees
• arbustus – planted with trees
• arca – box, cell, chest, coffin, money box
• arcanum – sacred secret