yectoplasm yellow because most pencils are yellow
Yellow, Green, Black, Blue and Red rings.
yardstick
Fushigi Yûgi.
yamacha
yardstickyearbook
Yoghurt
yawn
Ypres.
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.