Mainframe and Overall

Mainframe noun - A large digital computer serving 100-400 users and occupying a special air-conditioned room.

Overall and mainframe are semantically related in general topic. In some cases you can use "Overall" instead a noun "Mainframe".

Overall noun - Usually plural) work clothing consisting of denim trousers (usually with a bib and shoulder straps.

Mainframe and overall are semantically related in general topic. Sometimes you can use "Mainframe" instead a noun "Overall".