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Forty eight words take E in the second box and C in the third. R and D start twenty of them between them.
Eleven words put K in the fourth box, twenty three percent, and most then finish with S. DECKS, NECKS and BECKS are all built the same way, from a four letter word plus an S, which makes the branch large but not very informative once you are inside it.
Outside it, A takes nine words and H and C take six each. DECAY, DECAL, RECAP and MECCA come out of those three.
DECOR, GECKO, PECAN and FECAL are whole words rather than a stem with an ending bolted on, which makes them better opening guesses. They spread across several different fourth letters.
Thirteen of the forty eight finish with S and seven with Y. That is twenty of the list riding on the final box, so pinning it down early pays here.
In lowercase it means a place that draws a lot of people to it. It is also one of six words in this group that double a letter.
G, E, C, K, O. The CK runs across the third and fourth boxes, the same shape as DECKS and NECKS but with a very different ending.
R leads with twelve words and D follows with eight. F and P have four each, and sixteen letters appear in that box in total.