Pager is the word.

I can use the words: cheval glass, gaper, hand glass, imager, looking glass, pier glass, polished metal, reflector, seeing glass or speculum.

According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 1 words with the pattern GAPER-. That is, six letter words with 1st letter G and 2nd letter A and 3rd letter P and 4th letter E and 5th letter R. In alphabetical order, they are:

gapers

According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 6 words with the pattern GA-ER. That is, five letter words with 1st letter G and 2nd letter A and 4th letter E and 5th letter R. In alphabetical order, they are:

gager

gamer

gaper

gater

gayer

gazer

The continental shelf is home to a variety of benthic animals that live buried at the bottom of the ocean. Examples of some are, common whelk, blue mussel, Neptune whelk. periwinkle, Yoldia hyperborea, sand gaper, limpet, scallop, chiton, common starfish, green sea urchin, brittlestar, ragworm, pectinaria worm, scaleworm, skeleton shrimp, isopod, barnacle, benthic amphipod