Homonyms: filter and philter
Tutoring English, homonyms are a favourite topic of mine. The tutor mentions the pair filter and philter.
A filter is a porous barrier to separate solids from liquid; a philtre is a magic potion – often, specifically, a love potion.
“Philtre” can also be spelled “philter.”
Source:
Gilmour, Lorna (editor). Collins Essential Canadian English Dictionary & Thesaurus. Glasgow: HarperCollins, 2006.
Mish, Frederick C. (editor). Merriam-Webster Dictionary. Springfield: Merriam-Webster, 2004.
Jack of Oracle Tutoring by Jack and Diane, Campbell River, BC.