different between lightlike vs eightlike

English

light +? -like

lightlike (comparative more lightlike, superlative most lightlike)

(mathematics) (of a four-vector) Having a space component whose magnitude is equal to its time component multiplied by the speed of light.

eight +? -like

eightlike (comparative more eightlike, superlative most eightlike)

(rare) Shaped like a figure eight.
- 1965, August Aichhorn, Otto Fleischmann, Paul Kramer, Helen Ross, Delinquency and child guidance: selected papers
  ...with the contemporaneously developing notion about the eightlike shape of the crumpled wheel and the figure eight more generally.
- 2006, Jorge Cañizares-Esguerra, Nature, empire, and nation
  For example, some scholars thought that an eightlike figure on the robe of the Virgin signified that the image was the eighth wonder of the world.

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