YELLING
Yellow jackets (insects) are scary. They begin with the letter Y.
The Yellow Rat Snake is a scary animal. It begins with the letter y.
y-axis
Younger
yummy
Yogast
yhngbgh
Yes
Yummy, yucky, yolky and yabby are some of the sweet words that start with the letter y.
Some four letter words that start with Y are:yankyardyarnyawnyeahyearyellyelpyipeyogayokeyolkyoreyouryowlyuckyuleyurt
Scary
yawning