Underground, background
campground
playground
fairground
foreground
battleground
backgroundfairgroundforegroundgroundworkgroundbreakinggroundhoggroundskeepergroundswellgroundwaterplaygroundunderground
I think rainbow is a compound word because rain and bow is a word.
volcanic
Some compound words beginning with 'earth' are: earthbound, earthenware...
The present tense of ground is grind.
The compound word that ends in "look" is "outlook."
One compound word ending with by is......... Driveby!
under-ground
Endpoint.
hotub
whiteboard
bookseller
rowboat
bloodbank
snowflake
buckeye
basketballbaseballblackballbutterballdirtballeyeballfootballmeatballsnowballspitballfireballgoofballgumballhighballvolleyball