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Synonyms for Underwater (same or very similar meaning)

WordNet sense 1 (beneath the surface of the water):
submerged, submersed

WordNet sense 2 (beneath the surface):
subsurface

WordNet sense 3 (growing or remaining under water):
subaqueous, subaquatic

WordNet sense 4 (operating or living or growing in water):
aquatic


From the ODE community, based on WordNetadd/edit