downstairs
down-stairs
noun
The lower floor or floors of a building.
"The downstairs is much colder."
adverb
To or on a lower floor or level of a building.
"She went downstairs for breakfast."
adjective
Situated on a lower floor of a house or building.
"The downstairs bathroom needs cleaning."
Thesaurus
Synonyms: ground-floor, on a lower floor, below, down the stairs
Antonyms: on a higher floor, up the stairs, upstair, upstairs