7-letter words with I as the 3rd letter and O as the 4th letter

The fixed pattern is _ _ I O _ _ _, with 39 entries accepted by at least one tournament dictionary. Familiar examples include IDIOTIC, BRIOCHE, and ORIOLES, but just two matches meet our common-word frequency cutoff. Dictionary coverage also varies sharply: Collins has 38, compared with 28 in NWL2023 and 24 in ENABLE.

At a glance: counts, endings, and top score

• 39 tournament-dictionary words fit the pattern _ _ I O _ _ _.
• Collins includes 38 matches, NWL2023 includes 28, and ENABLE includes 24; these totals overlap.
• AZIONES scores 16, the top score; TRIOXID, PAIOCKE, and PAIOCKS score 15.
• 17 matches end in S, compared with 8 ending in C; only 2 meet the common-word frequency cutoff.

Which letters start and end these matches?

A final S is the clearest ending clue: 17 of the 39 matches end in S, more than twice the 8 ending in C. ORIOLES and ADIOSES show the S ending; BRIOCHE and AVIONIC show the C ending.

Starts are less lopsided: T leads with 10, A follows with 8, and P contributes 4. TRIODES, TRIOLET, and THIONYL show the T group; ABIOSES and ABIOTIC illustrate A. With the middle fixed, the first and final letters quickly narrow the possibilities.

7-letter words with I as the 3rd letter and O as the 4th letter

AZIONES is the top scorer at 16 points, ahead of TRIOXID, PAIOCKE, and PAIOCKS at 15. BRIOCHE reaches 14, so a recognizable food word still scores well without taking the lead. THIONYL and IDIOTCY follow at 13, AVIONIC at 12, and the average score is 10.1, so the leader sits about 6 points above a typical match.

Recognition is the limitation: only two entries meet the common-frequency cutoff, and many are uncommon forms. Dictionary totals differ across the set, so check your game's word list before playing an unfamiliar word. Thirty-three of the 39 matches have definitions, which means most obscure entries are real words with meanings, not noise.