i don't believe there is another word that means exactly that number. There is penta-, which is a prefix that means 5, pentagon which is a 5 sided figure, quintuplets which is 5 babies born together or a slang term for 5 things...
add?
The additive opposite is negative five (-5).
The multiplicative opposite (reciprocal) is one fifth (1/5).
cinco is spanish for 5.
There is no precise opposite, but laugh is a good possibility.
The usual antonym of narrower is "wider."
A five letter word that is the opposite of the word "gradual" and contains a second letter of "l" is a popular word game answer. The five letter word being sought is "fleet."
The opposite of "sweet" is "sour."
Opposite day is actually many days, five to be precise. It is on January 19, March 14, June 15, October 2, and December 31.
Opposite faces always add to 7. Two is opposite five.
enter
A five letter word meaning the opposite of hurry would be dally. There may well be others
There is no precise opposite, but laugh is a good possibility.
night
front
plain
Sharp
awake
fresh
giant
small