motherboard

As a proper noun mother

is one's mother.

As a noun motherboard is

(computer hardware) the primary circuit board of a personal computer, containing the circuitry for the central processing unit, keyboard, mouse and monitor, together with slots for other devices.

As a noun motherboard

is the primary circuit board of a personal computer, containing the circuitry for the central processing unit, keyboard, mouse and monitor, together with slots for other devices.

As an adjective planar is

of or pertaining to a plane.

As nouns the difference between motherboard and harddrive

is that motherboard is the primary circuit board of a personal computer, containing the circuitry for the central processing unit, keyboard, mouse and monitor, together with slots for other devices while harddrive is alternative form of hard drive.

As nouns the difference between microprocessors and motherboard

is that microprocessors is while motherboard is (computer hardware) the primary circuit board of a personal computer, containing the circuitry for the central processing unit, keyboard, mouse and monitor, together with slots for other devices.