Translation

The Japanese word for "Spider" is kumo クモ.

Romaji ku mo
Hiraganaくも
Katakanaクモ
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スパイダー
Hiraganaすぱいだー

Further Reading

Wikipedia: Spider (クモ)
Wolf Spider.