Zucchini is one word. It begins with z.
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.
zero
zèbre
Seize.
Zounds!
zincography
alchochaz
zealouszebrazinniaZounds
nuzzle
Zebra