Careful word choice alone can make you sound more professional. Here is the list of 5 banned words at my studio, because I have found that these words are an instant turnoff to clients seeking an upscale experience:
Shoot: I do not shoot people, I photograph them.
Viewing session: This sounds like someone passed away.
Sell: Clients invest, I do not sell to them.
Picture or Photo: I create portraits, I do not take pictures or photos.
Pixels: I never talk about what size a file is.