track / tract
A path or a following, versus a pamphlet, a parcel of land, or a system in the body.
A track is a path, a course, or the act of following. A tract is a short pamphlet, a parcel of land, or a system of organs. Do not write digestive track or housing track when you mean the pamphlet, the land, or the organs.
Examples
UseThey lost the track in the brush.
UseHe handed out a political tract.
AvoidThe digestive track was inflamed.