This is the 6744th most frequent Russian word.
spacex
The Russian word "spacex" does not exist; it refers to the American aerospace company "SpaceX" when transliterated into Russian.
Here, 'SpaceX' is used as the name of the company responsible for launching the rocket.
Компания SpaceX запустила новую ракету Falcon 9.
The company SpaceX launched a new Falcon 9 rocket.
In this context, 'SpaceX' is used to refer to the subject of the news or achievements.
Вчера я читал статью о новых достижениях компании SpaceX.
Yesterday I read an article about the new achievements of SpaceX.
Here, 'SpaceX' is used to describe the owner of the space missions being performed.