Hydrogen-bomb and Hydrogen bomb

Hydrogen-bomb verb - Attack with a hydrogen bomb.

Hydrogen bomb and hydrogen-bomb are semantically related. In some cases you can use "Hydrogen bomb" instead a noun phrase "Hydrogen-bomb".

Hydrogen bomb noun - A nuclear weapon that releases atomic energy by union of light (hydrogen) nuclei at high temperatures to form helium.

Hydrogen-bomb and hydrogen bomb are semantically related. Sometimes you can replace phrase "Hydrogen-bomb" with "Hydrogen bomb", this phrases are similar.