app – n. a computer software program for a smartphone or other electronic device

delivery – n. the act of transporting something to someone

casual – adj. easygoing; unofficial

ghost – n. the spirit or presence of a dead person

fund – n. a financial or investment program

rent – v. paying someone for the use of something

customer – n. someone who purchases a product or service

convenience - n. a quality or situation that makes something easy or useful for someone by reducing the amount of work or time required to do something

concept - n. an idea of what something is or how it works