weed – n. plant that tends to grow where not wanted and to prevent the growth of more desirable plants usually by taking up space

spray – v. to put a stream of small drops of liquid on something

herbicide – n. chemical used to destroy plants, especially weeds

tractor – n. motor vehicle with large back wheels and thick tires used on farms for pulling heavy loads and machinery

rig – n. piece of equipment or machinery used for a particular purpose

option – n. the chance or ability to choose something or to choose between two or more things

pesticide – n. chemical substance used to kill harmful insects, small animals, wild plants, and other unwanted organisms