sub·pro·gram 
(sŭbprō′grăm, -grəm)
(sŭbprō′grăm, -grəm)n.
A computer program contained within another program that operates semi-independently of the encasing program.
- groundsel
- groundsel
- groundsel
- ground sheet
- groundside
- groundsill
- groundskeeper
- groundskeeping
- ground sloth
- ground speed
- groundspeed
- ground squirrel
- ground state
- ground stroke
- ground substance
- groundswell
- ground tissue
- ground truth
- groundtruth
- ground-truth
- groundwater
- ground water
- ground wave
- groundwork
- ground zero