system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5:What is the difference between an atom bomb, a hydrogen bomb, and a thermo nuclear bomb?
gpt
* An atom bomb derives its energy from enriched uranium or plutonium undergoing nuclear fission.

* A hydrogen bomb uses an atom bomb to initiate nuclear fusion in lithium deuteride or other fusionable substance.  Obviously the atom bomb contributes some of the energy.

* "thermonuclear bomb" is roughly a synonym for hydrogen bomb.

* There is also something called a "boosted fission bomb".  This is basically an atom bomb, but adds a small amount of tritium/deuterium which undergoes fusion.  This contributes a small amount of energy by itself, but causes much more fission to take place, increasing yield.