different between phatic vs photic

English

From Ancient Greek ????? (phatós, “spoken”), from ???? (ph?mí, “I say”)

phatic (comparative more phatic, superlative most phatic)

(linguistics) Pertaining to words used to convey any kind of social relationship.
- 1978, Anthony Burgess, 1985:
  Generally speaking, statements in WE are expected to be of a tautologous nature, thus fulfilling the essential phatic nature of speech.
- 2006, Thomas Pynchon, Against the Day, Vintage 2007, p. 467:
  Dispensing with phatic chitchat, he began straightaway to tell the story of his “people.”

photo- +? -ic

photic (comparative more photic, superlative most photic)

Of, related to, or irradiated by light; especially describing that part of the near-surface ocean is which photosynthesis is possible.

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