Computer hardware and Mainframe

Computer hardware noun - (computer science) the mechanical, magnetic, electronic, and electrical components making up a computer system.

Mainframe and computer hardware are semantically related. In some cases you can replace term "Mainframe" with "Computer hardware", this terms are similar.

Mainframe noun - (computer science) the part of a computer (a microprocessor chip) that does most of the data processing.

Computer hardware and mainframe are semantically related. Sometimes you can use "Computer hardware" instead a noun "Mainframe".