No, thermonuclear bombs [1] are fusionbombs. Nuclear bombs can be of both types but the term thermonuclear specifically means (partly) fusion-powered bombs. The

No, thermonuclear bombs [1] are fusionbombs. Nuclear bombs can be of both types but the term thermonuclear specifically means (partly) fusion-powered bombs. These bombs always use a fission reaction as a starter for the fusion reaction, depending on the type of bomb the power output can be anywhere from mostly fusion to largely fission. [1] https://en.wikipedia.org/wiki/Thermonuclear_weapon https://en.wikipedia.org/wiki/Thermonuclear_weapon