Denshi Jisho — Online Japanese dictionary

にけん two ken (approx. 3.6m)
Noun 
にげん duality; binary (system)
Noun, No-adjective 
にこう second watch (approx. 9 pm to 11 pm)
Noun, Archaism 
にこう dyadic
Noun, No-adjective, Computer terminology 
にごん 1: double-dealing; double tongue; going back on what one has said;
2: repeating oneself
Noun 
にさん two or three
Adverbial noun 
にしゃ two things; two persons
Noun, No-adjective 
にしゅ 1: two kinds;
2: second-class (e.g. mail)
Noun 
にしん postscript; PS
Noun 
にしん duplicity; treachery; double-dealing
Noun 
にしん binary
Na-adjective, Noun 
にじき two meals (a day)
Noun 
にじゅ demon of ill health; disease
Noun, Archaism 
にじょ second daughter
Noun 
にすい kanji "ice" radical
Noun 
にそう sergeant first-class (JSDF)
Noun 
にそう two-phase
Noun, No-adjective 
にそく 1: two legs; two feet;
2: two pairs
Noun, No-adjective 
につう two copies
Noun 
にとう second class
Noun 
にとう disaccharide
Noun 
ににん two persons; two people; pair; couple
Noun 
にねん two ideas
Noun 
にはち sixteen
Noun, Archaism 
にばい double; twice; twofold
Noun 
にふう forced out on second
Noun 

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