different between penthos vs benthos

English

Ancient Greek ?????? (pénthos)

penthos (uncountable)

sorrow; grief; mourning or sadness
- 1974, Guy Davenport, Tatlin!:
  He watched with a chill of wonder the basalt mask splotched with ivy shadow whose round eyes stared back with Kolonian penthos, Dushara with his face among leaves.

From Ancient Greek ?????? (bénthos, “the depths”).

benthos (plural not attested)

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