Denshi Jisho — Online Japanese dictionary

とうし fighter (for); militant; champion (of); boxer
Common word, Noun 
とうし fighting spirit; (will to) fight
Common word, Noun 
とうき fighting spirit
Noun 
とうぎ competition; contest
Noun 
争う あらそう 1: to compete; to contest; to contend;
2: to quarrel; to argue; to dispute; to be at variance; to oppose;
3: (usu. in negative form) to deny (e.g. evidence)
Common word, Godan verb with u ending, Intransitive verb 
たたかう to fight; to battle; to combat; to struggle against; to wage war; to engage in contest
Common word, Godan verb with u ending, Intransitive verb 
とうそう strife; conflict
Common word, Noun, Suru verb, No-adjective 
たたかい battle; fight; struggle; conflict
Noun 
とうぎょ fighting fish
Noun 
とうけい cockfight; fighting cock
Noun 
とうけん dogfighting; a fighting dog
Noun 
とうこん fighting spirit
Noun 
とうちゃ tea-tasting contest
Noun 
とうびょう fighting against an illness
Common word, Noun, Suru verb 
とうぎゅう bullfighting; bullfight
Noun 
とうしょう brave leader
Noun 
とうじょう fight; struggle; conflict
Noun, Suru verb 
わす たたかわす 1: to compete; to vie; to contend;
2: to make fight against another (person, animal); to pit against; to set against;
3: to debate; to argue
Godan verb with su ending, Transitive verb 
構え とうがまえ kanji "fighting" radical
Noun 
技場 とうぎじょう arena
Noun 
牛士 とうぎゅうし matador; bullfighter
Noun 
争心 とうそうしん belligerence; fighting spirit
Noun 
構え たたかいがまえ kanji "fighting" radical
Noun 
い構え たたかいがまえ kanji "fighting" radical
Noun 
志満々 とうしまんまん brimming with fighting spirit; being strong in the will to fight; burning with combativeness
Usually written using kanji alone, No-adjective, Taru-adjective, Adverb taking the 'to' particle 
志満満 とうしまんまん brimming with fighting spirit; being strong in the will to fight; burning with combativeness
Usually written using kanji alone, No-adjective, Taru-adjective, Adverb taking the 'to' particle 
志を燃やす とうしをもやす to burn with combativeness
Expression, Godan verb with su ending 
牛場 とうぎゅうじょう a bullring
Noun 
病生活 とうびょうせいかつ (means and time spent) fighting against an illness
Noun 
争うべからざる あらそうべからざる indisputable
Expression, Pre-noun adjectival 

Found 30 words.

You can also

Look up kanji details for 闘 あらそう.

Try a Yahoo Jisho search for 闘 あらそう .
Try a Goo Jisho search for 闘 あらそう .
Try a Google search for 闘 あらそう .