Lots of nouns have antonyms, more or less. At least they have what we might think of as opposites.
day - night
summer - winter
purchase - sale
zenith - nadir
poverty - wealth
happiness - sadness
heat - cold
success - failure
truth - falsehood
virtue - vice
panic - calm
I don't suppose any nouns that denote objects (
clock, chair, table, lamp, wallet, ...) or substances (
sugar, butter, meat, ...) have antonyms, however.
CJ