gutter, ditch, sewer, drain, 10**32

Radicals

• 側溝【そっこう】
  gutter, ditch
• 海溝【かいこう】
  ocean trench, deep
• 排水溝【はいすいこう】
  drainage, gutter, ditch
• 溝【みぞ】
  ditch, drain, gutter, trench, groove, tread, indentation, gap (between people, countries, etc.), gulf, rift
• 溝【こう】
  10^32, hundred nonillion
• 溝【どぶ】
  ditch, drain, gutter, trench, gap (between cutting guides)