different between seamark vs daymark

English

sea +? mark. Compare landmark.

seamark (plural seamarks)

Any elevated object on land which serves as a guide to mariners, such as a hill or steeple.
A beacon, buoy, etc. placed in the sea to aid navigation.
- 1608, William Shakespeare, The Tragedy of Coriolanus, V. iii. 74:
  Like a great sea-mark, standing every flaw, / And saving those that eye thee!

day +? mark

daymark (plural daymarks)

A mark (such as a tower) designed to help navigators to find their way during daylight hours.

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