Denshi Jisho — Online Japanese dictionary

馬跳 うまとび (game of) leapfrog; leapfrogging
Noun, Suru verb 
午年 うまどし year of the horse
Noun 
馬蝿 うまばえ horse botfly (Gasterophilus intestinalis)
Noun 
馬蠅 うまばえ horse botfly (Gasterophilus intestinalis)
Noun 
馬槽 うまぶね horse trough
Noun, Archaism 
馬偏 うまへん kanji "horse" radical at left
Noun 
馬道 うまみち long roofed passageway (originally having an earthen floor and used as a bridle path)
Irregular kana usage, Noun 
生日 うまれび birthday
Noun 
海牛 うみうし sea slug (various orthogastropod species, esp. of order Nudibranchia); nudibranch
Noun, Usually written using kana alone 
海獺 うみうそ sea lion
Noun, Archaism 
海馬 うみうま sea horse
Noun 
海鰓 うみえら sea pen (any coelenterate of the family Pennatulidae or related families); sea feather
Noun, Usually written using kana alone 
海獺 うみおそ sea lion
Noun, Archaism 
海風 うみかぜ sea breeze
Noun 
海亀 うみがめ loggerhead; sea turtle
Noun 
海側 うみがわ seaward side
Noun 
海霧 うみぎり sea fog
Noun 
海草 うみくさ marine plant
Noun 
海草 うみぐさ marine plant
Noun 
海幸 うみさち marine products
Noun 
海茸 うみたけ Barnea dilatata (species of piddock)
Noun, Usually written using kana alone 
海釣 うみづり sea fishing
Noun 
海鳥 うみどり sea bird
Noun 
海蜷 うみにな many-formed cerith (Batillaria multiformis)
Noun, Usually written using kana alone 
海葱 うみねぎ white squill (Urginea maritima); sea onion
Noun 
海猫 うみねこ black-tailed gull (Larus crassirostris)
Noun 

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