weedkiller

As nouns the difference between paraquat and weedkiller

is that paraquat is a poisonous yellow herbicide derived from bipyridine while weedkiller is a chemical agent that destroys unwanted plants (weeds) but not wanted ones (crops etc.

As nouns the difference between weedkiller and sulfosate

is that weedkiller is a chemical agent that destroys unwanted plants (weeds) but not wanted ones (crops etc while sulfosate is the trimethylsulfonium salt of glyphosate that is marketed under various names as a weedkiller.

As nouns the difference between weedkiller and phytocide

is that weedkiller is a chemical agent that destroys unwanted plants (weeds) but not wanted ones (crops etc) while phytocide is an agent that kills plants, such as weedkiller.