superbomb
noun
su·per·bomb ˌsü-pər-ˈbäm 
plural superbombs
: an extremely powerful bomb
specifically : hydrogen bomb
In July 1941 the committee reported that a superbomb could be made with isotopically separated uranium-235. 
Robert L. Weber
Robert L. Weber 
Word History
First Known Use
1915, in the meaning defined above
- marsh elder
- marsh felwort
- marsh fern
- marsh fever
- marsh five-finger
- marsh fleabane
- marsh fleawort
- marsh foxtail
- marsh frog
- marsh gas
- marsh gentian
- marsh goose
- marsh grass
- marsh groundsel
- marsh hare
- marsh harrier
- marsh hawk
- marsh hen
- marsh holy-rose
- marsh holywort
- marsh horsetail
- marsh mallow
- marsh marigold
- marsh milkweed
- marsh owl