雄牛[oushi] bull
牡牛座[oushiza] Taurus (constellation)
乾燥牛乳[kansougyuunyuu] powdered milk
牛脂[gyuushi] beef tallow
牛飼い[ushikai] cattleman

牛耳る[gyuujiru] to control
牛舎[gyuusha] cow shed
牛車[gyuusha] ox carriage (for Heian era nobles)
牛小屋[ushigoya] cow shed

馬酔木[asebi] Japanese andromeda (Pieris japonica)
馬鈴薯[jagaimo] potato (Solanum tuberosum)
じゃじゃ馬[jajauma] restive horse
玖馬[kyuuba] Cuba
トロイの木馬[toroinomokuba] Trojan horse

巴奈馬[panama] Panama
馬克[maruku] mark
羅馬字[roomaji] Latin alphabet
ワープロ馬鹿[waapurobaka] someone whose kanji-writing ability has suffered due to overreliance on the kana-to-kanji conversion systems used to input Japanese text on a computer
愛馬[aiba] favourite horse