A word that we always hear and think we understand, but in reality someone's relationship with suicide can be a lot more complex than what we would usually understand it to be.
When we think of suicide, we think of someone committing the act that results in their death and when we say that someone has taken their own life or committed suicide, then that would be correct to say.
It was around that age that not only did I have the suicidal thoughts leading up to the attempt, but it is such that it is now a regular thought process in my brain for most days of my life, but it doesn't necessarily mean that I will undertake any of these thoughts.
It's important that you talk to the person and understand what is going on inside their head and the risk that they are posing to themselves regardless of it being thoughts or actual acts or preparation.