Translation

The Japanese word for "Spider" is kumo クモ.

Romaji ku mo
Hiragana
Katakana
Kanji 蜘蛛
School Level ,

Loan-word

The word "Spider" katakanized would be supaidā スパイダー.
Romaji su pa i daa
Katakana
Hiragana

Further Reading

Wikipedia: Spider (クモ)
Wolf Spider.