A blower upper
a pyrotechnic...i think
A person who studies bombs is called an explosives expert or ordnance specialist. They are trained in the science of explosives and bomb-making techniques to prevent and investigate incidents involving explosives.
For bombs such as atomic or nuclear, I believe it is a nuclear engineer.
you call them bitefull
a traveller...
belligerent
sharp
a geologist
Pyromaniac.
geek
a traveller...
There is no special name for a person who likes squirrels.