Translation

sāpento means "Serpent" in English.
It's a katakanization, a loan-word.

sāpento is normally written with katakana, as サーペント.
sāpento written with hiragana is さーぺんと.
sāpento does not have kanji.
Romaji saa pe n to
Katakana
Hiragana

Orthography Notes

Synonyms

Scientific name: Serpentes.

Further Reading

Wikipedia: ヘビ (Snake)