different between flagstone vs causey

English

flag +? stone

flagstone (plural flagstones)

From Anglo-Norman caucie, chaucee et al., from Late Latin calce?ta. In Guernsey use after Guernsey Norman cauchie.

causey (plural causeys)

(obsolete) An embankment holding in water; a dam. [14th-18th c.]
(now dialectal) A causeway across marshy ground, an area of sea etc.
- c. 1460, Merlin, vol. II:
  than com Soriondes with all his peple that was so grete, and sette ouer the cauchie so rudely as horse myght renne.
- 1974, GB Edwards, The Book of Ebenezer Le Page, New York 2007, p. 177:
  I could see through the open doorway some fishermen in guernseys sitting on the grass listening, and a boat was drawn up on the shingle and others moored to the cauchie.
(now dialectal) A paved path or highway; a street, or the part of a street paved with paving or cobbles as opposed to flagstones.
- 1667, John Milton, Paradise Lost, X:
  Satan went down The Causey to Hell Gate.

Send