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Ground warblerground water
ground wave
Ground wheel
Ground wren
ground zero
ground-berry
ground-controlled approach
ground-effect machine
ground-emplaced mine
ground-floor
ground-service crew
ground-shaker
groundage
groundball
groundberry
-- groundbreaker --
groundbreaking
groundbreaking ceremony
groundcover
Groundedly
Grounden
grounder
groundfish
groundhog
Groundhog Day
Grounding
groundkeeper
Groundless
Groundling
Groundly
groundmass
Groundnut
groundbreaker
| Noun | 1. |  groundbreaker - someone who helps to open up a new line of research or technology or art |