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
In the word "oxygen," the letter "y" makes the "ee" sound.
EE - electrical engineereeler - a person who catches eels
agree, emcee, levee, melee, raree, three
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").