As nouns the difference between cup and nematocalyx
is that
cup is cup while
nematocalyx is (zoology) a kind of cup or calicle containing nematocysts, found upon hydroids of the family plumularidae.
As a verb cup
is to not attend a course, a class without permission of the teacher or
cup can be to temporarily or permanently cease to provide (electricity or water supply) or
cup can be to switch off (a breaker or fuse).