fusion bomb 
noun
A bomb deriving its energy from nuclear fusion, especially a hydrogen bomb.Therefore, by encasing a fission bomb within a fusion bomb, several problems could be solved....
- From a military standpoint, the fusion bomb had one powerful advantage over the fission bomb.
- While at Los Alamos, Teller began his own research on the feasibility of a thermonuclear or hydrogen fusion bomb.
- come in handy
- come into
- come into effect
- come into its (or one's) own
- come into line
- come into (or go out of) operation
- come into (or go out of) use
- come into (or to) one's kingdom
- come into play
- come into question
- come into the world
- comeliness
- comely
- come naturally
- come of
- come of age
- come off
- come off it
- come off second best
- come on
- come one's way
- come on strong
- come on to
- come (or appear or arrive) on the scene
- come (or bring someone) back (down) to earth