Denshi Jisho — Online Japanese dictionary

にん 1: counter for people;
2: (Noun) (usu. in compound words) person
Common word, Counter 
にん obligation; duty; charge; responsibility
Common word, Noun 
にん kernel
Noun 
にん endurance; forbearance; patience; self-restraint
Noun, Archaism 
ニン nymph
Noun 
しのぶ 1: (Usually written using kana alone) Davallia mariesii (species of fern);
2: Lepisorus thunbergiana (species of fern);
3: color of clothing layers under one's overcoat (light green on blue);
4: (Abbreviation) ancient women's hairstyle;
5: (Abbreviation) clothing patterned using the fern Davallia mariesii
Noun 
しのぶ 1: to conceal oneself; to hide;
2: to endure
Common word, Godan verb with bu ending, Transitive verb 
任意 にん any; arbitrary; optional; discretion; non-specific; unspecified; free will
Common word, Na-adjective, No-adjective 
認可 にん approval; license; licence; permission
Common word, Noun, Suru verb 
人気 にん popularity; popular feeling; business conditions
Common word, Noun, No-adjective, Na-adjective 
任期 にん term of office
Common word, Noun 
認知 にん acknowledgement; acknowledgment; recognition; cognition
Common word, Noun, Suru verb, No-adjective 
妊婦 にん pregnant woman
Common word, Noun, No-adjective 
任務 にん duty; function; office; mission; task
Common word, Noun 
しのび 1: stealth;
2: (Abbreviation) travelling incognito (traveling);
3: (Abbreviation) ninjutsu;
4: (Abbreviation) ninja;
5: sneak theft; sneak thief;
6: tolerance
Noun 
にん endurance; stoicism
Noun, Suru verb 
にん ninja implement (shuriken, etc.)
Noun 
人時 にん man-hour
Noun 
仁治 にん Ninji era (1240.7.16-1243.2.26)
Noun 
任地 にん one's post; appointment
Noun 
仁和 にん Ninna era (885.2.21-889.4.27)
Noun 
人日 にん man-day; person-day
Noun 
認否 にん approval or disapproval
Noun 
人夫 にん laborer (labourer); construction worker; coolie
Noun, Sensitive 
にんまり complacent smile
Noun, Suru verb, Adverb 
にんにく garlic (edible plant, Allium sativum)
Noun 

Found 301 words. Page one, two, three, four, five, six, seven, eight, nine, 10, 11, 12

You can also

Look up kanji details for 忍 にん.

Try a Yahoo Jisho search for 忍 にん .
Try a Goo Jisho search for 忍 にん .
Try a Google search for 忍 にん .