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

The pattern is _OS__, so the first and last letters do most of the work. COSTS, POSTS, and HOSTS show the familiar plural ending, while LOSER and POSED take the same middle pair in different directions. Only 15 of the 77 entries rank among the top 25,000 English words by frequency, so expect plenty of less familiar options too.

The _OS__ pattern at a glance

• There are 77 five-letter matches, with O second and S third.
• COSTS, POSTS, and HOSTS are recognizable examples ending in S.
• C is the most common first letter, beginning 10 entries.
• S is the most common final letter, ending 20 entries; Y follows with 11.
• Eight matching words appear among Wordle answers, and 76 are allowed guesses.

How do these words vary around OS?

The first letter is more varied than a quick scan of COSTS might suggest. C leads with 10 matches, while H, M, P, and R each begin 8. That gives you several distinct starts to test when the middle pair is already confirmed.

The final letter makes a sharper split: 20 words end in S, compared with 11 ending in Y. Noses, roses, and doses show the plural-S route; bossy, mossy, and posey show the Y ending. A useful solving rule: once O and S are fixed, test the last position before cycling through every possible opener.

The neighboring patterns put this count in perspective. Replacing O with A in the second position gives 126 matches, and U gives 91, both above this set’s 77. Keeping O but changing the third letter to R yields 232, so S makes the pattern notably narrower.

Which _OS__ words score well or fit Wordle?

BOSKY tops the Scrabble scoring examples at 14 points; HOSEY, BOSKS, MOSKS, and TOSHY each score 11. BOSKY is the standout when you need points, but the familiar COSTS or POSTS may be easier to spot during a timed game.

Eight words in this pattern are Wordle answers, while 76 are allowed guesses. The answer count is much smaller than the guess count, so treat a legal guess as a way to test letters, not as evidence that it is a likely solution. The full pattern also includes many uncommon entries; check your game’s word list before relying on a tournament-dictionary match.