Yelnats mentioned
langosta as a missing word
in the 7 by many club thread.
The word is in a few dictionaries, although with slightly different definitions. Merriam-Webster says, "a South or Central American spiny lobster of the genus Panulirus". The online Oxford says, "(US) another term for
langouste".
A recent usage example is
from the Miami New Times in May this year, where a photo was captioned,"The langosta from Como Como inside the Moxy Miami South Beach".
It will be accepted in future as a rare word.