How do you spell Gaper

Available Definitions:
1)  n. - One who gapes.
2)  n. - A European fish. See 4th Comber.
3)  n. - A large edible clam (Schizothaerus Nuttalli), of the Pacific coast; -- called also gaper clam.
4)  n. - An East Indian bird of the genus Cymbirhynchus, related to the broadbills.