yectoplasm yellow because most pencils are yellow
Yellow, Green, Black, Blue and Red rings.
yardstick
yawn
Yoghurt
yamacha
Ypres.
yardstickyearbook
Fushigi Yûgi.
There are no-known cookies that start with y, unless you name your cookies Yerladoodles or something that starts with y. Sorry that there are no cookies that start with "y"...
Uniform
yak milk
Yachts and yardsticks are tangible objects.