precursor /prē-kûrˈsər/

1. Something that exists or goes in advance of another
2. An indication of the approach of an event
3. A forerunner, herald or harbinger
4. A predecessor
5. A substance from which the one in question is derived or manufactured (chem)

• south-west-by-south
• south-west-by-west
• south-wester
• south-westerlies
• south-westerly
• south-western
• south-westers
• south-westward
• south-westwardly
• south-westwards
• souvenir
• souvenired
• souveniring
• souvenirs
• souvlaki
• souvlakia
• sou'-west
• sou'wester
• sou'westers
• sov
• sovenance
• sovenances
• sovereign
• sovereign debt
• sovereign debts