different between ryllet vs rillet

English

ryllet (plural ryllettys)

rill (“small stream”, “brook”, “rivulet”) + either -et or -let

rillet (plural rillets)

A little rill.
- ?, Alfred Tennyson, Recollections of the Arabian Nights
  From the green rivage many a fall / Of diamond rillets musical.
- 1953, Isaac Asimov, Second Foundation (1971 Panther Books publication), part II: “Search by the Foundation”, chapter 8: ‘Seldon’s Plan’, page 86, ¶ 1
  First, a pearly white, unrelieved, then a trace of faint darkness here and there, and finally, the fine neatly printed equations in black, with an occasional red hairline that wavered through the darker forest like a staggering rillet.

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