The crossword solutions for the term 'Lava Lamp Lump' are BLOB, which is a four-letter word. A BLOB is a shapeless mass or lump of something, and this term is often used to describe lava lamps. Lava lamps are decorative lamps that contain a colored wax-like substance that rises and falls inside a glass container filled with a clear liquid. The motion of the wax creates an interesting and mesmerizing effect.