The Japanese word for Dragon is "Ryuu"
カッター Kattā
Doragonfurūtsu
ドラゴンストライキ
ryu no ha
Kagami Ryū
Doragon iki
'Kinzoku no ryuu'.
ginryu
ryu-ken
to say dragon in Japanese is 龍 and it is read ryuu hope this helps :)
'Small dragon' would be 小さい竜 (chiisai ryuu) in Japanese.