Half track and Half-track

Half track noun - A track that goes around only rear wheels.

Half-track and half track are semantically related. In some cases you can use "Half-track" instead a noun phrase "Half track".

Half-track adjective - Having caterpillar treads on the rear and wheels in front.

Half track and half-track are semantically related. Sometimes you can replace phrase "Half track" with "Half-track", this phrases are similar.