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Gravity!
The weakest of the four forces is gravity by a huge margin
No, covalency does not have its own intermolecular force
London Force
There are only four ways that substances interact, or if you prefer, four forces in the universe. They are gravity, the weak nuclear force, electro-magnetic, and the strong nuclear force. In molecules ( presumably in liquid or gaseous states ) they will be slightly pulled together by gravity, but it is the electro-magnetic force that governs everything else. Whether they bind together, break down into component atoms or simpler molecules, form new compunds, etc. is all part of the electro-magnetic interaction.
Solid state matter has maximum intermolecular force.
intermolecular force
predominant force
This is an intermolecular force.
This is an intermolecular force.
dispersion force (London)
Boiling point is a property not a force; but a high boiling point indicate a strong intermolecular force.