-scope — instrument for viewing, to look (affix)

telescope B2

/ˈtɛl.əˌskoʊp/ An instrument that makes distant objects look closer and larger, especially stars and planets.

microscope B2

/ˈmaɪ.kɹəˌskoʊp/ An instrument that makes very small objects look much bigger so they can be studied.

periscope C2

/ˈpɛɹɪskəʊp/ an optical instrument that provides a view of an otherwise obstructed field

stethoscope C2

/ˈstɛθəsˌkoʊp/ a medical instrument used to listen to sounds made by the heart, lungs, and other internal organs

kaleidoscope C2

/kəˈlaɪdəˌskoʊp/ a tube containing mirrors and loose colored pieces that form changing symmetrical patterns when rotated