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upstairs vs upstair

upstair vs upstairs

upstairs is a noun but upstair is not a noun.

upstairs and upstair both are adjectives.

upstairs is an adverb but upstair is not an adverb.

Word NounAdjectiveVerbAdverb
upstairs Yes Yes No Yes
upstair No Yes No No
As adjectives, upstairs and upstair are synonyms defined as:
  • upstairs and upstair: on or of upper floors of a building
upstairs (noun) upstair (noun)
the part of a building above the ground floor
upstairs (adjective) upstair (adjective)
on or of upper floors of a building on or of upper floors of a building
upstairs (adverb) upstair (adverb)
on a floor above
with respect to the mind
Difference between upstairs and upstair

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