What's the difference between formula mass, molecular mass, and gram formula mass?

MASS: generally a measure of an object's resistance to changing its state of motion when a force is applied. It is determined by the strength of its mutual gravitational attraction.

Molecular mass or molecular weight is the mass of a molecule.

Gram formula mass (a.k.a. molar mass) is defined as the atomic mass of one mole of an element, molecular compound or ionic compound. The answer must always be written with the unit g/mol (grams per mole).

They are like other investigations? say there was a murder u have to do blood test and finger prints which run through a lab.