This is the 4125th most frequent Japanese word.
モスバーガー
"モスバーガー" is the name of a Japanese fast-food chain specializing in hamburgers.
Here, 'モスバーガー' is used as the subject of the sentence to refer specifically to the chain's name.
モスバーガーは日本で人気のあるファーストフードチェーンです。
MOS Burger is a popular fast food chain in Japan.
In this example, 'モスバーガー' refers to the establishment where the activity took place.
昨日、モスバーガーでてりやきバーガーを食べました。
Yesterday, I ate a Teriyaki Burger at MOS Burger.
Here, 'モスバーガー' indicates the brand associated with the new menu being tried.