powerhead 
noun
A part of an engine or other device that supplies power.Bombardier purchased powerheads from Suzuki for use on Evinrude and Johnson engines.
- sexual politics
- sexual psychopath
- sexual psychopathy
- sexual relations
- sexual repression
- sexual reproduction
- sexual revolution
- sexual selection
- sexual system
- sexuate
- sexuated
- sexupara
- sexupare
- sexuparous
- sex urge
- sexvir
- sexvirate
- sex work
- sex worker
- sexy
- Seychelles
- Seychellois
- Seyfert galaxy
- Seym
- Seymour, Jane