Ground-floor and Head start

Ground-floor adjective - On the floor closest to level with the ground.

Head start and ground-floor are semantically related. in starting point topic. In some cases you can use "Head start" instead a noun phrase "Ground-floor".

Head start noun - The advantage gained by beginning early (as in a race).

Ground-floor and head start are semantically related. Sometimes you can replace phrase "Ground-floor" with "Head start", this phrases are similar.