A compound containing the epoxide functional group can be called an epoxy, epoxide, oxirane, and ethoxyline.  Simple epoxides are often referred to as oxides.  Thus, the epoxide of ethylene (CH) is ethylene oxide (CHO).  Many compounds have trivial names; for instance, ethylene oxide is called "oxirane". Some names emphasize the presence of the epoxide functional group, as in the compound 1,2-epoxyheptane, which can also be called 1,2-heptene oxide.
A polymer formed from epoxide precursors is called an epoxy, but such materials do not contain epoxide groups (or contain only a few residual epoxy groups that remain unreacted in the formation of the resin).