Which is hotter the explosion of a thermonuclear bomb or the core of the sun and explain why?

The temperatures are similar within about an order of magnitude, but the core of the sun is hotter.

The thermonuclear bomb is at the temperature of DT fusion, the lowest temperature at which fusion can occur. The sun, in addition to fusing DT, is fusing HH, HD, DD, DHe-3, TT, He-3He-3, all of which ignite at various temperatures higher than DT.