大人おとなのおもちゃ屋や

• アダルトショップ

  More direct loanword for 'adult shop'; 大人のおもちゃ屋 is a softer, more euphemistic Japanese phrase.

• 大人おとなのおもちゃ

  Refers to adult toys themselves, not the shop.

• 大人おとなのおもちゃ屋や

  Standard spelling using おもちゃ (toy) in kana; the most common written form.

• 大人おとなの玩具おもちゃ屋や

  Kanji spelling for おもちゃ (玩具); less common but still seen, especially in more formal or written contexts.

Compound of 大人 (おとな, adult) + の (possessive particle) + おもちゃ (toy) + 屋 (や, shop). A straightforward descriptive phrase.