Butterfly is much less fun to say than papillon so I am using the standard process in the English language: deprecating a common-usage word and replacing it with a foreign word that I like better. From now on, all uses of the word ‘butterfly’ shall be deemed archaic.
Thank you for your patience during the transition.
@david_chisnall I'll admit that the only reason I know the word papillon is the TV show Miraculous, les aventures de Ladybug et Chat Noir.