For a while can be used to mean 'for a short period of time'.
After a short period you can take another test in 2 weeks.
Another word could be era.
short manner
One word that usually means "not short" is tall. The other major antonym is long.
short is a rootword. examples: shortage, shorter, shorten
not short
short - They were short on experience.
A short novel or a long short story.
petite
trip
the period
No, but you need to capitalize it. You put a period after Mr. because it is short for Mister. You put a period after Mrs. because it is short for Missus. But Miss is already a short word so doesn't need an abbreviation.