| mainspring(noun, cause) |
| might(noun, trouble, power, strength, energy) |
| momentum(noun, trouble, power, strength, energy) |
| motive(noun, cause) |
| muscle(noun, trouble, power, strength, energy) |
| necessity |
| obligement |
| operation(performance, accomplishment, functioning, execution, implementation) |
| origination(noun, cause) |
| overabundance(discharge, flood, deluge, inundation, overpopulation) |
| overcrowding(discharge, flood, deluge, inundation, overabundance) |
| overflow(noun, flood, inundation) |
| overkill(discharge, flood, deluge, inundation, overabundance) |
| overmuch(discharge, flood, deluge, inundation, overabundance) |
| overproduction(discharge, flood, deluge, inundation, overabundance) |
| pains(noun, trouble, power, strength, energy) |
| physical energy(noun, expression, trouble, power, strength) |
| plethora(discharge, flood, deluge, inundation, overabundance) |
| potency(noun, trouble, power, strength, energy) |
| potential(noun, trouble, power, strength, energy) |