This is the 1516th most frequent Japanese word.
コーラ
Cola.
Here, 'コーラ' is a noun referring to the beverage known as cola. It is used as the object of the verb '注文しました' (ordered).
このレストランでコーラを注文しました。
I ordered cola at this restaurant.
In this case, 'コーラ' is the subject of the sentence, describing the characteristic of cola and its suitability during summer.
コーラは冷たいので、夏にはぴったりです。
Cola is cold, so it's perfect for summer.
Here, 'コーラ' is a noun used in conjunction with 'サンドイッチ' (sandwich), suggesting a pairing of cola as a drink with food.