N4 - 残念ざんねん
disappointment
N3 - 記念きねん
commemoration, memory
N2 - 観念かんねん
(1) idea, notion, conception, (2) sense (e.g. of duty)
N1 - 概念がいねん
general idea, concept, notion
N1 - 念ねん
sense, idea, thought, feeling, desire, concern, attention, care
N1 - 無念むねん
chagrin, regret