There are books for synonyms like dictionaries or simply do a search on the Net. Synonym for imminent, will get you all you need.
Immediate, likely, certain, settled.
Roget's Thesaurus Roget's Thesaurus
Source as in the source of a problem. Synonym- Start Source as in where you found something- Area
it is a synonym for imminent, fated, inescapable so yes usually though you would ask something like "is inevitable a synonym for ________?"
Synonyms for the word upcoming: approaching, forthcoming, future, imminent, impending, looming, nearing, next
map maker is the synonym for cartographer. source: dicitonary.com
Wiki Answers, a dictionary, or a thesaurus. (thess OH russ)
approaching, forthcoming, close, nearing, following, inevitable, unavoidable
incitement, ammunition, provocation, incentive
Origin, derivation, source, root...
Distasteful is a synonym. Can't find an antonym
A thesaurus would be the best source to find a synonym for the word "contamination" to avoid redundancy in a research paper. Thesauruses provide a range of alternative words with similar meanings that you can use to enhance the clarity and variety of your writing.