Translation

supaidā means "Spider" in English.
It's a katakanization, a loan-word.

supaidā is normally written with katakana, as スパイダー.
supaidā written with hiragana is すぱいだー.
supaidā does not have kanji.
Romaji su pa i daa
Katakana
Hiragana

Orthography Notes

Synonyms

Further Reading

Wikipedia: クモ (Spider)
komorigumo 子守蜘蛛.