I don't really want to act dumb or anything but I just wanted to see that I can't believe that everyone gets to read this so thank you, thank you, thank you!
Writing coherent sentences will do more for your intellectual appearance than anything else.
For a list of Science Fiction terms starting with z see link.
science words that starts with a
Zygote.
Possibly the word zap would fit the bill.
On the periodic table: Yttrium Zinc
A space word that starts with z is Zaurak.
Another word for a blimp that starts with a Z is a Zeppelin
zenith is a complementary word that starts with z. It means on the top, or the best.
zoology unless your thinking of different terms!
Zucchini is one word. It begins with z.
zoology is a type of science
zero
zèbre