The letter 'A' should be subtracted from the word 'mangoes' to make the word 'gnomes'.
specter
The Roc is a mythical, giant bird.
Avalon
'UNICORN'
You cannot send a letter to the Greek Gods because they are mythical. The postal service does not deliver letters to mythical places. You can pray to the gods which is similar to sending a letter.
Eros
HO-OH
ewerewe
Argo
roc
Mangoes. Meringue. Mutton. Marshmallows.
Eros