grou - high
- hard-alloy insert
- hard-burned gypsum
- hard-burned plaster
- hard-burnt brick
- hard-chine boat
- hard-cleaning coal
- hard-coal coke
- hard-constrained canceller
- hard-copy (output )device
- hard-copy (output )device
- hard-copy keyboard
- hard-core area
- hard-drawn wire
- hard-driving modulation
- hard-faced drill bit
- hard-facing [hard-surfacing] electrode
- hard-finish plaster
- hard-glass fiber
- hard-hat diving
- hard-limiter repeater
- hard-magnetic alloy
- hard-magnetic material
- hard-racing flux
- hard-rock geologist
- hard-rubber mold
- hard-sectored disk
- hard-sized board
- hard-superconducting alloy
- hard-surface mask
- hard-surface master
- hard-surface photomask
- hard-surface runway
- hard-surfacing
- hard-to-machine material
- hard-to-reach area
- hard-top convertible
- hard-wall plaster
- hard-wall type clean room
- hard-water soap
- hard-wired logic