7-letter words with O as the 2nd letter and S as the 3rd letter

That fixed OS pair still leaves a varied set: POSTING and HOSTING are familiar forms, while COSTUME and POSTURE name everyday things. Only 21 entries meet the common-word frequency measure, so many answers are less obvious. The first letter gives you a practical way to narrow the pattern, especially when a puzzle has already ruled out several openings.

How many words fit the O-S pattern?

• There are 225 tournament-dictionary words with O second and S third.
• POSTING, COSTUME, and HOSTING are recognizable examples of the pattern.
• P leads the set with 41 words; R follows with 32 and C with 30.
• A final S is especially common: 85 entries end in S.
• JOSEPHS and POSTFIX top the scoring ranks at 19 points each.

Why do so many of these words finish in S?

The 85 words ending in S make that final letter a strong clue, but it does not identify one word family. POSTERS, FOSSILS, MOSQUES, and GOSPELS all fit, with different openings and meanings. If S is already fixed at the end, start by checking the first letter rather than guessing from the middle pair alone.

P is the most productive opening here, with 41 matches; POSTING, POSTAGE, POSTMAN, and POSTWAR show how many different forms share that start. The pattern is narrower than several close relatives: the seven-letter O-R combination has 576 matches, while O-S has 225.

Dictionary coverage is not identical across games. Collins has 222 matches, compared with 156 in NWL2023 and 137 in ENABLE, so check your game's word list before relying on an unfamiliar entry.

How to narrow the O-S pattern

Use the fixed pair as an anchor, then test the first and last letters against your crossing clues. POSTING and COSTUME differ immediately at the opening; HOSTAGE and HOSTELS share their first three letters but diverge later. Those contrasts make the pattern easier to scan than treating all 225 answers as one undifferentiated set.

• Try P first if your opening square is unknown; it has 41 matches.
• If the final tile is S, prioritize that ending because 85 entries use it.
• For a six-letter comparison, the same O-S positions have 197 matches.
• For a different third letter, O-R has 576 seven-letter matches.