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Twenty five words carry T second and I third, and nearly all of them run STI.
S takes twenty two of the twenty five, eighty eight percent. ATILT, ATIMY and UTILE are the only entries that break it, and none of the three is a word you would produce unprompted.
All three run STIN and differ only in the final box. Each is ordinary English, so a puzzle could reasonably want any of them.
STILL, STILE and STILT do the same thing with an L. Between the two clusters, a large part of this page comes down to guessing a single closing letter.
L takes it in six of the twenty five and R in four, with M and N on three each. Nine letters appear there in all.
E closes six of the twenty five, ahead of T, Y and K on three each. The E ending comes from STILE, STIME, STIPE, STIRE and STIVE.
Two of the twenty five repeat a letter, so a repeat is worth ruling out early on a page this size.
STICK tests the C and K, which the STIN cluster never uses. STING sits inside the crowded branch and narrows less.
Useful, from the same Latin root as utility. It is formal and rare but perfectly valid.
A young bullock or heifer, in northern English and Scots farming. STIRP, a stock or lineage, sits nearby and is equally specialist.
Tilted, or in the posture of a jouster with lowered lance. It is one of the older a prefix adverbs.
A unit of luminance in the older centimetre gram second system. It has been replaced by the candela per square metre.