Dynamite Stuff is a term used to describe explosive materials, such as nitro (5 letters) and TNT (3 letters). Nitro is an abbreviation for nitroglycerin, a highly volatile liquid that is used in dynamite. TNT stands for trinitrotoluene, a yellow crystalline solid that is also used in dynamite. Both of these substances are powerful explosives and have been used in military and industrial applications for many years.