Exxon Alternative can be found in the crossword solutions SHELL (5 letters), ARCO (4 letters), and AMOCO (5 letters). SHELL is a multinational oil and gas company headquartered in the Netherlands, ARCO is an American oil and gas company owned by BP, and AMOCO is an American oil and gas company that was acquired by BP in 1998. All three companies are viable alternatives to Exxon, providing similar services in the oil and gas industry.