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Only nine words start with ES, and the third box is a consonant in every one.
T takes the third box in three of the nine, with C, K and S on two each. No vowel appears there at all, which is unusual even on a page this short.
It is the one entry here anyone would produce without prompting. ESTER is reachable if you remember school chemistry, and nothing else on the page is vocabulary you carry.
ESCAR and ESKAR are variant spellings of the same glacial ridge, and ESKER is a third. ESCOT, ESTOC and ESTOP are legal and historical terms, and ESSES is the plural of the letter name.
R closes four of the nine, forty four percent, more than every other letter combined. A, O and E share the fourth box evenly at three each.
Two words repeat a letter, both of them doubling the S. If a repeat shows, you are choosing between ESSAY and ESSES.
On this page it usually is. It is the only entry in general use and the only common word ending in Y here.
All three name a ridge left by a glacial stream. They differ in the third and fourth boxes, so confirming either one settles the group.
The opening needs a consonant cluster behind it and English builds very few. Nine entries is the whole page.