Denshi Jisho — Online Japanese dictionary

黒髪 ろかみ black hair
Noun, No-adjective 
黒樫 ろがし black oak
Noun 
黒金 ろがね iron
Noun 
黒鴨 ろがも black scoter (duck)
Noun 
黒衣 ろぎぬ black clothes
Noun 
黒熊 black bear
Noun 
黒雲 dark clouds; black clouds
Noun 
黒熊 ろぐま black bear
Noun 
黒々 ろぐろ deep black
Adverb, Adverb taking the 'to' particle, Noun 
黒黒 ろぐろ deep black
Adverb, Adverb taking the 'to' particle, Noun 
黒米 ろごめ unpolished rice
Noun 
黒犀 ろさい black rhinoceros (Diceros bicornis)
Noun, Usually written using kana alone 
黒鷺 ろさぎ eastern reef heron
Noun 
黒炭 ろずみ black charcoal
Noun 
黒鯛 ろだい black porgy (Acanthopagrus schlegeli)
Noun 
黒竹 ろち black bamboo
Noun 
黒茶 ろちゃ deep brown
Noun, Abbreviation 
黒土 ろつち black terracotta; black soil
Noun 
黒鶴 ろづる common crane (Grus grus)
Noun, Usually written using kana alone 
黒貂 ろてん sable (Martes zibellina)
Noun, Usually written using kana alone 
黒肉 ろに black sealing ink; black stamp pad
Noun 
黒猫 ろねこ black cat
Noun 
黒蠅 ろばえ blowfly (excluding bluebottles and greenbottles)
Noun, Usually written using kana alone 
黒番 ろばん black to play (in Go)
Noun 
黒服 ろふ 1: black suit; mourning clothes;
2: black-suited staff member (e.g. in restaurant, sex establishment, etc.)
Noun 
黒船 ろふね 1: black ships (i.e. Western ships, often painted with tar, that came to Japan in the 16th century);
2: product, person, etc. arriving from the West and disturbing the Japanese market, etc.
Noun 

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