6-letter words with S as the 3rd letter and I as the 4th letter

This _ _ S I _ _ frame is one of the broadest in this group, with 139 tournament-list entries and 26 common words. It spans everyday verbs such as LOSING and RISING, nouns such as VISION and FUSION, and high-value forms like UPSIZE. Endings vary widely, so the final two tiles can narrow the search fast.

Quick map of the SI frame

• 139 candidates match the two fixed positions.
• R begins 22 words, ahead of B at 15 and C at 12.
• The final-letter leaders are S (31), E (27), and G (26).
• UPSIZE scores 17; QASIDA scores 16.

How can the last two letters narrow the search?

Final tiles divide this frame into several groups: 31 entries end in S, 27 in E, and 26 in G. That spread explains why a fixed middle pair still leaves many options. If the board supplies a final S, familiar candidates include BASICS, VISITS, and ASSIST; for G, think of LOSING, RISING, or DESIGN.

R is the most common opening letter, with 22 words, followed by B at 15 and C at 12. The top examples also include EASILY, EASIER, DESIRE, and RESIST. Use the first and final letters together rather than treating the central SI as enough to identify a single answer.

Which high-value words are worth checking?

UPSIZE earns 17 points, QASIDA scores 16, and RESIZE and ASSIZE each score 15. These leaders sit beside ordinary words such as INSIDE and DESIGN, making the pattern useful both for recall and for rack evaluation. Check unfamiliar candidates against your game dictionary before playing them.

4, while 115 of the 139 words have recorded definitions. Still, only 26 meet the common-word cutoff.

This is a sizable vocabulary pool with a long uncommon tail; knowing a few familiar examples helps, but careful ending-letter filtering does more work than memorizing the entire set. Match those fixed slots against the rack before spending a turn on a weak guess.