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61 five letter words begin with EN, and nearly all of them are the prefix attached to a three letter root.
T leads at about fifteen percent, O at eleven, then A and D at ten each and a second E at eight.
ENJOY, ENACT, ENROL and ENDOW share only those two opening letters. The root that follows carries all the information, which is why the third box stays so flat.
ENTER, ENTRY, ENJOY, ENDED and ENEMY are the entries you are most likely to want, and they reach four different third letters.
ENJOY is the most informative opener. Its J, O and Y reach three separate branches and none of its letters repeats.
ENTER is the more common word, but it repeats its E and tells you less about what else might fit.
Between the two of them you have tested six letters and both of the branches that hold anything.
They share four letters and differ only at the end, so a guess on either one narrows the other to a single question.
It repeats its E, which costs a box, but the M and Y it tests appear in little else here, so a miss still helps.
It identifies a prefix rather than a word shape, so the three boxes after it can hold almost any workable root.