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Sixty six words put G first and A third. The GR opening takes the largest share and it is where most of the near duplicates live.
R takes the second box in twenty seven words, forty one percent of the pattern. L follows on fifteen, then N and U on seven each. Those cover fifty six of the sixty six between them.
GRACE, GRADE, GRAPE, GRATE, GRAVE and GRAZE differ in a single box each. So do GRAND and GRANT, and GRAIL and GRAIN. That branch is full of pairs, so a guess inside it usually confirms the shape you already had rather than narrowing it.
GIANT and GOALS step outside the consonant clusters entirely, and GNASH and GNATS use the silent G opening that nothing else on the page does. Those are the guesses that actually split the list.
S ends eighteen of these, twenty seven percent, and E another eleven. Only five words repeat a letter, so the doubling that shapes some patterns is close to absent here.
Yes, it runs G, R, A, P, H. GRASP and GRASS share the same first three letters and all three are common.
GNARL, GNASH, GNATS and GNAWS all open with a G nobody pronounces. There are seven of them and they are easy to forget for exactly that reason.
N on nine words and R on eight. Neither is decisive, so the fourth box is a weaker target than the second here.