記念【きねん】
commemoration, celebration, remembrance, memory, honoring the memory of, memento, souvenir, keepsake
懸念【けねん】
worry, fear, anxiety, concern
残念【ざんねん】
regrettable, unfortunate, disappointing, vexing
理念【りねん】
(Platonic) ideal (of how things ought to be, e.g. human rights), foundational principle, idea, conception (e.g. of the university), doctrine, ideology
念頭【ねんとう】
(on one's) mind, heed
記念日【きねんび】
memorial day, commemoration day, anniversary
概念【がいねん】
general idea, concept, notion
信念【しんねん】
belief, faith, conviction
断念【だんねん】
abandoning (hope, plans), giving up
念願【ねんがん】
one's heart's desire, one's dearest wish
執念【しゅうねん】
tenacity, persistence, obsession, implacability
丹念【たんねん】
painstaking, careful, meticulous, scrupulous, detailed, elaborate
記念碑【きねんひ】
commemorative plaque (usu. on a stone), stone monument (bearing an inscription)
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
祈念【きねん】
prayer
入念【にゅうねん】
careful, elaborate, scrupulous
念仏【ねんぶつ】
nembutsu, nianfo, the three-word invocation "Namu Amida Butsu" dedicated to the Amitabha Buddha, visualizing a Buddha (in one's mind)
念入り【ねんいり】
careful, scrupulous, thorough, conscientious, elaborate, deliberate, attentive
専念【せんねん】
absorption, giving undivided attention, devoting oneself (to)