Below are possible answers for the crossword clue Lightener.
6 letter answer(s) to lightener
LEAVEN
a substance used to produce fermentation in dough or a liquid
an influence that works subtly to lighten or modify something; "his sermons benefited from a leavening of humor"
cause to puff up with a leaven; "unleavened bread"
8 letter answer(s) to lightener
PEROXIDE
a viscous liquid with strong oxidizing properties; a powerful bleaching agent; also used (in aqueous solutions) as a mild disinfectant and (in strong concentrations) as an oxidant in rocket fuels
an inorganic compound containing the divalent ion -O-O-
bleach with peroxide; "She must peroxide her hair-it looks unnaturally blond"
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