Translation

The Japanese word for "Dinosaur" is kyouryū 恐竜.

Romaji kyou ryuu
Hiraganaきょりゅ
Katakanaキョリュ
Kanji
Meaning Fear Dragon
School Level

Loan-word

The word "Dinosaur" katakanized would be dainosō ダイノソー.
Romaji da i no soo
Katakana
Hiragana

Further Reading

Wikipedia: Dinosaur (恐竜)