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Most often the “fancier” words are loanwords from other language. Plaintiff/Defendant are from the French “pleintif/defendant”, litigation is from Latin. Firefighter, firetruck, and other compound words were created relatively recently compared to the others. Firefighters, firetrucks and newspapers mostly didn’t exist until after English mixed with other languages.
I’ve never seen “most environmental” or “fewer turns”. We get “fewer toll roads” and sometimes “avoids traffic” during rush hour