Synonyms for Investigation

Synonyms starting with letter O

• observation

  thorough check, reconnoitering, inspection
• once-over

  inspection
• observing

  thorough check
• oral
• ordeal
• officiousness
• overlook
• outline
• organ
• opinion
• once over
• opinion poll
• occupation

  research
• observations
• one-step
• overview
• or skill
• operation
• official inquiry
• overhauling
• observance
• outcome

  consequence, effect
• outgrowth

  outcome, effect