- 観客【かんきゃく】 - spectator, audience 
- 観察【かんさつ】 - observation, survey, watching 
- 観光【かんこう】 - sightseeing, tourism 
- 観光客【かんこうきゃく】 - tourist 
- 観念【かんねん】 - idea, notion, concept, conception, sense (e.g. of duty), resignation (to one's fate), acceptance, preparedness, observation and contemplation, meditation 
- 観測【かんそく】 - observation, survey, measurement, opinion, prediction, thinking 
- 悲観【ひかん】 - pessimism, (taking a) gloomy view, discouragement, despondency, despair, disappointment 
- 客観的【きゃっかんてき】 - objective 
- 客観【きゃっかん】 - objectivity, objective, object (philosophical) 
- 観衆【かんしゅう】 - spectators, onlookers, members of the audience 
- 楽観的【らっかんてき】 - optimistic, hopeful 
- 外観【がいかん】 - outward appearance, exterior appearance, outward show, looks 
- 観賞【かんしょう】 - admiration, appreciation, enjoyment, viewing (for pleasure) 
- 先入観【せんにゅうかん】 - preconception, preconceived notion, prejudice 
- 価値観【かちかん】 - sense of values, values, value system 
- 主観【しゅかん】 - subjectivity, subject (philosophical), ego, one's personal opinion, one's own idea 
- 傍観【ぼうかん】 - looking on, standing by and watching, sitting back and watching, remaining a spectator 
- 主観的【しゅかんてき】 - subjective 
- 観戦【かんせん】 - watching a (sports) game, spectating, observing (military operations) 
- 観覧【かんらん】 - viewing