This is the 877th most frequent Japanese word.
システム
System.
システム is used to refer to a general complex construct that aids functionality.
このシステムは使いやすいです。
This system is easy to use.
システム is referred to here as an existing structure or process experiencing difficulties.
そのシステムにはいくつかの問題があります。
That system has several issues.
システム is used to refer to a newly implemented process or set of operations.