IMO

1. In my opinion (also imo)
2. International Maritime Organization
3. International Miners' Organization

• sparing
• sparingly
• sparingness
• sparingnesses
• spark
• spark chamber
• spark chambers
• spark coil
• spark coils
• sparke
• sparked
• sparked-out
• sparkes
• spark gap
• spark gaps
• sparkie
• sparkier
• sparkiest
• sparking
• sparking-plug
• sparking-plugs
• sparkish
• sparkishly
• sparkle
• scourgers