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ferret
Grosbeak (bird) and yak are animals that end with the letters AK. Avocet (bird), cricket, egret, hornet, parakeet, piglet (baby pig) and yellow jacket are animals that end with the letters ET.
Et cetera
Extra-terrestrial
gourmand (masc.), spelled gourmande when in the feminine.
Cabaret
If I've understood you correctly, you are looking for: √ET Which is Tick-ET, ie Ticket.
Here are a few of them :)BetGetJetLetMetNetPetSetTetVetWetYet
Letters fetters wetters
buffet ballet
Elliot's last name is never mentioned.
extra terrestrial