A hydrogen bomb is, by far, the most destructive weapon that mankind has ever invented. It is the most powerful type of nuclear bomb.
hbomb (hydrogen bomb)
Heather Wallis goes by Hbomb.
H Haden Hammond goes by HBomb.
The correct word is e-mail. The word is a contraction of "electronic mail" and just as "hydrogen bomb" reduces to H-bomb not Hbomb, so electronic mail reduces to e-mail, not email. Other examples are:e-learninge-commercee-business