As nouns the difference between tournsol and turnsol
is that tournsol is a violet-blue dye got from the plant chrozophora tinctoria while turnsol is .
tournsol
English
Noun
(-)
A violet-blue dye got from the plant Chrozophora tinctoria
Usage notes
This spelling is largely found in the 18th and 19th centuries. The more usual modern spelling is turnsole.