Let me say this a slightly different way: typically drag is divided into at least two types:Despite what the Cambridge dictionary may say, boneh3ad is right - aerodynamic drag differs from friction in a number of important ways, and generally should not be considered to fall under the umbrella of "friction". In addition, even if you insist on calling drag "friction", that's still not what causes reentry heating, which is almost entirely a result of compression in the shock ahead of the object.
- Friction drag: caused by particles of air essentially rubbing on the surface of the object.
- Pressure or form drag: caused by the pressure changes in the airflow around the object.
- Wave drag: sometimes listed as its own category, sometimes a subset or pressure drag. It's the supersonic version
How much of each of these matters depends on the speed of the object and for this particular thread, pressure or more specifically wave drag is pretty close to the entire issue.
So calling all drag "friction" is at best an overly broad description that for this particular thread misses the key part of the drag. I sometimes lean toward not being pedantic, but on this particular issue I think the difference matters.