Quenya 

arwa

in control of, possessing

arwa (1) adj. "in control of, possessing" (followed by genitive, e.g. *arwa collo, "having a cloak [colla]"). Also suffix -arwa"having", as in aldarwa "having trees, tree-grown" (3AR). In a deleted entry in the Etymologies, -arwa was glossed "having, possessing, holding, controlling" (VT45:14)