devotee
Spree, agree...
You say ee-ee, for example Pompeii is pronounced pom-pay-ee-ee.
the y in oxygen is the letter that makes the ee sound
Tree Flee Glee Knee
Eel
agree, emcee, levee, melee, raree, three
In the word "oxygen," the letter "y" makes the "ee" sound.
EE - electrical engineereeler - a person who catches eels
The word "bookkeeper" fits this description. It ends with a double "r" and also has two different double letters in it, which are "oo" and "ee."
The word oxygen is not normally pronounced with a long E. The common US prounciation reduces the Y to an "ih" sound (as in "sit") : (OKS-ih-gen)
The Greek letter "H" is pronounced "ee," and is a feminine article (the word "the").