Example:
All that I could see in my Aunt Edna's sewing box were three empty spools, with no thread left on them. 
Photo license:
CC: Attribution, Commercial Use
Regionalism:
Neutral
Regional variant:
Neutral
Full Expression:
The “ool” Sound ( /u:/ ) : spool
a cylindrical object made for having something (like wire, or thread, or rope) wrapped around it