1. For the most part
   - principally, primarily, mainly, in the main, majorly

See also: chief

• power train
• power trip
• power unit
• power user
• power walking
• power worker
• power-assisted
• power-assisted steering
• power-dive
• power-driven
• power-station worker
• powerboat
• powerboating
• powerbroker
• powered
• powerful
• powerfully
• powerfulness
• powerhouse
• powerless
• powerlessly
• powerlessness
• powerwash
• Powhatan
• powwow