Weed-killer is a term used to describe any type of chemical or natural substance used to kill weeds. The crossword solutions for the term weed-killer are HOE (3 letters), HOER (4 letters), PARAQUAT (8 letters), and HERBICIDE (9 letters). HOE is a tool used to remove weeds from soil, while HOER is a person who uses a HOE to remove weeds. PARAQUAT is a synthetic HERBICIDE used to kill weeds, and HERBICIDE is a general term for any chemical used to kill plants.