Are covalent compounds and covalent molecules the same thing ?

Not much difference. 
A covalent bond is formed between two elements of similar Electronegativity. Practically pure covalent bonds are possible only in homonuclear diatomics(O2,H2,etc.). All other strong bonds are either polar(considerable electronegativity difference) or ionic (very high electronegativity difference) in nature.

A covalent compound is simply one in which all the atoms are linked by covalent bonds. E

1) when you rub your hands together quickly, the kinetic energy is converted to mechanical energy.2) thermal energy from the sun travels to earth as infrared waves.3) energy is transferred through the matter of space by electromagnetic waves. 4) when a match is burned, chemical potential energy is converted to thermal and radiant energy. 5) seismicwaves are caused by back and forth movement , or vibration, of an object. 6) mechanicalenergy in an engine changes thermal energy into kinetic energy to make a car move.