水すい素そ爆ばく弾だん

す

い

そ

ば

く

だ

ん

Meanings

1

noun

hydrogen bomb

A nuclear weapon using hydrogen fusion; often contrasted with 原子爆弾 (atomic bomb). The abbreviation 水爆 is also common.

原げん子し爆ばく弾だん
Atomic bomb; uses nuclear fission, while 水素爆弾 uses fusion and is typically more destructive.
水すい爆ばく
Abbreviation of 水素爆弾, commonly used in news and technical contexts.

Compound of 水素 (hydrogen) and 爆弾 (bomb), a calque of English 'hydrogen bomb'.