"loss" is a noun, while "lost" is the past participle form of "lose".
Therefore, " The lakers loss the game." is wrong. It should be "The lakers lost the game". Likewise, the sentence "my toy is loss" is wrong, and it will be " my toy is lost".
"loss" should be used as noun. For example, 1 The businessman suffered a huge loss . 2 I have lost my toy and the loss is due to my negligence. 3 "asianbma is always at a loss regarding the uses of lost and loss". Here, the expression " at a loss" means confused