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Seventy one words place I second and S third, which puts the S inside the word rather than on the end.
T takes the fourth box in thirteen of the seventy one, giving LISTS, MISTY, FISTS, GISTS and PISTE. E matches it on thirteen, and between them they cover a large share of the group.
VISIT, LISTS, RISKS, VISTA and DISKS are the most useful. DISCO, RISES, VISAS and MISTY all come up often enough to matter.
DISCS and DISKS are both here, both plural, and both in current use. The choice between C and K is a spelling preference rather than a difference in meaning, which makes them a genuine coin flip in a puzzle.
DISCI and DISCO sit in the same branch, so confirming DIS still leaves several live options.
S closes twenty six of the seventy one and Y closes twelve. Between them they take a large share of the last box, so both are worth ruling out early.
VISIT uses the I twice, which wastes part of the guess. LISTS or RISKS will usually tell you more about the shape of the group.
A gadget or unnamed device, more often spelled gizmo. Both spellings are accepted and only this one fits the pattern.
To go astray, an old formation built the same way as misplace or misread. It is rare but valid.
Eight of them do. CISTS, FISTS, GISTS, HISTS, KISTS, LISTS and MISTS are all plurals of short nouns ending in ST.