Igneous and Molten

Igneous adjective - Produced by the action of fire or intense heat.

Molten and igneous are semantically related in produced by volcanic heat topic. In some cases you can use "Molten" instead an adjective "Igneous". popular alternative

Molten adjective - Reduced to liquid form by heating.

Igneous and molten are semantically related in produced by volcanic heat topic. You can use "Igneous" instead an adjective "Molten", if it concerns topics such as melted. popular alternative