6-letter words with I as the 1st letter and S as the 5th letter

The pattern I _ _ _ S _ gives you a compact set, but the words vary sharply in familiarity. INVEST, INSIST, and IMPOSE are recognizable choices; many of the remaining matches are less common. Four entries are among the most frequent English words; the average score is 9 points, and the final letter offers a useful clue.

The I-and-S pattern at a glance

• There are 27 matches across the tournament dictionaries; Collins includes all 27, while ENABLE and NWL2023 include 22 each.
• INVEST, INSIST, and IMPOSE are familiar examples that fit I _ _ _ S _.
• Ten matches end in T, and nine end in E, making those useful final-letter checks.
• IMBOSK and IMMASK lead the scoring at 14 points each.

Why do so many matches end in T or E?

T and E together account for 19 of the 27 final letters: ten words end in T and nine in E. INVEST and INSIST show the T ending, while IMPOSE and INCASE show the E ending. If your last tile is known, test those two endings first.

The familiar words are a small slice of the pattern: only four matches count as common. The rest include less everyday forms such as INCUSE, IONISE, and IDLEST. That gap matters in a puzzle; a plausible-looking word is not necessarily one you will recognize.

How should you use these matches?

Start with the visible letters, then sort candidates by the ending. INVEST and INSIST are easy to recall, but their shared final T does not make them interchangeable: the middle letters differ. IMPOSE and INCASE give you two E-ending checks without changing the fixed I and S positions.

For 6-letter words with I as the 1st letter and S as the 5th letter, dictionary coverage is a real limitation: Collins has 27 matches, compared with 22 in both ENABLE and NWL2023. Some choices therefore depend on the word list used in your game, so check that list before relying on an unfamiliar entry. For higher scores, IMBOSK and IMMASK reach 14 points, while the average is 9.