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Synonyms for Daydream (same or very similar meaning)

WordNet sense 1 (absentminded dreaming while awake):
reverie, daydreaming, oneirism, revery, air castle, castle in Spain, castle in the air

WordNet sense 2 (have dreamlike musings or fantasies while awake):
moon

WordNet sense 3 (have a daydream; indulge in a fantasy):
dream, stargaze, woolgather


From the ODE community, based on WordNetadd/edit