Compare foo with other words:
foh vs. foo
foo vs. foy
foo vs. hoo
fon vs. foo
foo vs. goo
coo vs. foo
foo vs. roo
foo vs. woo
foo vs. fro
fob vs. foo
doo vs. foo
foo vs. fop
foo vs. loo
foo vs. poo
foo vs. moo
fog vs. foo
foo vs. fox
foe vs. foo
foo vs. foot
foo vs. for
foo vs. too
foo vs. food
foo vs. quux
foo vs. object
foo vs. fool
darn vs. foo
bar vs. foo
foo vs. lot