Atomic
Part of speech: adjective
Definition: Of, or relating to atoms Of, or employing nuclear energy or processes Infinitesimally small Unable to be split or made any smaller Said of an operation that is guaranteed to either complete fully, or not at all.
Example sentence: The atomic bomb certainly is the most powerful of all weapons, but it is conclusively powerful and effective only in the hands of the nation which controls the sky.
Thermonuclear
Part of speech: adjective
Definition: Of, or relating to the fusion of atomic nuclei at high temperaturesOf, or relating to the use of atomic weapons based on such fusion, especially as distinguished from those based on fission