Envelop is a verb meaning to cover or surround something completely. Pronunciation wise, the accent is on the second syllable.
Example: The long dress was too big for her. It enveloped her completely. (note that the simple past adds an ‘ed’ to Envelop, making it look even more like Envelope.)
Envelope is a noun meaning a paper covering for documents sent by mail. Pronunciation wise, the accent is on the first syllable.
Example: I received an envelope in the mail last week. For once, it wasn’t a bill.
Enveloppe is the French word for envelope. Living in Canada and being bilingual in both of its official languages, English and French, I often forget which is which until spellcheck tells me otherwise. That’s only helpful if I’m writing on a digital platform. Sadness.
Do you have any tricks to share to remember the difference? Asking for a friend. 😉