N5
かぎ、カギ
Definition
key, lock
N4
きゅうこう
Definition
moving at high speed, express (e.g. train that bypasses many stations)
N3
うめ、むめ、ウメ
Definition
Japanese apricot (Prunus mume), Chinese plum, lowest (of a three-tier ranking system)
N2
えんとつ
Definition
chimney, smokestack, funnel (of a ship), stovepipe, carrying a passenger without turning on the taximeter
N1
いこう
Definition
intention, idea, inclination