a section of a company responsible for modification of an existing product or making a new one (p,d)

the time a device can work without charging (b,l)

a product that is of higher than usual quality (p,p)

a group of people who discuss a particular subject in order to solve a problem or suggest ideas (f,g)

a person who buys something or someone whose job it is to decide what will be bought by a company (b)

to give someone a higher or more important position (p)

simple for people to use (u)