Synonyms for Back end:

n.

ADC, auxiliary device, accelerated graphics port, accelerator card, bus, bridgeware, base hardware, A drive, AGP. back (noun)
rear, backside.
back end (noun)
rear, backside.
location (noun)
rear, backside.

Other synonyms:

accelerator card, auxiliary device, accelerated graphics port, base hardware, A drive, ADC, bus.