This is the 6120th most frequent Japanese word.
オモチャ
Toy.
Here, オモチャ is used as a direct noun referring to an object designed for play, typical in its application.
子供は新しいオモチャで遊んでいます。
The child is playing with a new toy.
In this sentence, オモチャ again acts as a noun but emphasizes the possessive aspect (the toy in question), focusing on its condition, 'broken.'
そのオモチャは壊れてしまった。
That toy has broken down.
Here, オモチャ qualifies 'cars,' showing its role as a modifier describing the type of cars ('toy cars') and tying it to the concept of miniatures.