This is the 13588th most frequent Korean word.
로봇청소기
Robot vacuum cleaner.
Here, '로봇청소기' is used as the subject of the sentence, performing the action described by the verb.
로봇청소기가 방을 청소하고 있어요.
The robot vacuum cleaner is cleaning the room.
In this sentence, '로봇청소기' serves as the direct object, the entity being bought.
나는 로봇청소기를 새로 구매했어요.
I bought a new robot vacuum cleaner.
Here, '로봇청소기' is part of the object within the sentence, describing what is being sold.