Synonyms of the word 
GROUND-FLOOR → DOWNSTAIR - DOWNSTAIRS
ground-floor
- adj. Situated on the ground floor.
downstair
- adj. (dated) downstairs.
downstairs
- adj. A floor lower than the one a speaker currently occupies.
- adv. living, stepping, or coming down the stairs.
- n. The lower floor of a house, at ground level.
- n. (slang) The genitalia.
If you are interested in words, visit the following sites :
- wiktionary.org/ground-floor For complete definition of a word
- 1word.ws/groundfloor to play with words, suffixs, prefixs, etc.