Z is For ...
Zipper - Consider the zipper. It eventually replaced the more tedious buttons or hooks & eyes of previous styles of fastener. Have you ever looked closely at a zipper to see how it works? Those little teeth intermesh so neatly with each other. Everything works fine (except in those cases where the center of the zipper pops open).
Zoo - I love zoos. I love going to zoos. If I visit a city with a zoo, I try to set aside one day to go to the zoo. The San Diego Zoo  is marvelous (the Wild Animal Park too). But I htink my forever favorite is the National Zoo in Washington, DC. When I lived in suburban Maryland for two years, I had a "membership" for the zoo. I went to the zoo as often as I could.
Zoology - In College, as a Microbiology major, I had a choice between taking the introductory Botany or Zoology courses. I chose Botany over Zoology because I preferred to take apart carrots and spinach rather than mice and frogs.
Zoster - Part of the name for the virus, Varicella-Zoster, that causes Chickenpox and Shingles.  I managed to contract Chickenpox (a second time?) as an adult. I've talked to other people who were similarly unfortunate and realize that I had a remarkably easy (if boring) case. Varicella-Zoster is a member of the Herpes family, which means it sticks around and goes "latent". If it becomes active again, the secondary disease is Shingles. Thus, anyone who has had Chickenpox (which is most people) is a possible candidate for Shingles later in life.
Zounds - A fine old Shakespearian expletive!
Zucchini - Zucchini is not my favorite vegetable in most forms; however, I dearly love zucchini bread.