These words sometimes sound the same but have different meanings.

to has to do with movement toward a place
too is another word for also
two is a number

vein is a vessel returning blood to the heart
vain is to be overly proud of oneself
vane is a device used to show wind direction

wet is when something is covered by water
whet is to stimulate an appetite

which has to do with showing the one that qualifies
witch is one who practices witchcraft

yolk is the yellow center of an egg
yoke is a frame of wood joining two oxen at their necks