Translation

hiyaena means "Hyena" in English.
It's a katakanization, a loan-word.

hiyaena is normally written with katakana, as ヒヤエナ.
hiyaena written with hiragana is ひやえな.
hiyaena does not have kanji.
Romaji hi ya e na
Katakana
Hiragana

Further Reading

Wikipedia: ハイエナ (Hyena)