誰か[dareka] someone
誰だって[daredatte] anyone
誰も[daremo] everyone
誰知らぬ[dareshiranu] nobody knows
誰それ[daresore] someone

誰何[suika] challenging (an unknown person)
誰ひとりも[darehitorimo] (with a negative) no-one
誰彼無しに[darekarenashini] to whomever
誰がために[tagatameni] for whom