Hidden inside oirno sit inro, iron, noir and 1 other, four-letter plays tied at the top of this rack with 4 points in Scrabble apiece. In all, 15 valid words come out of this rack, grouped by length below and checked for Words With Friends as well as Scrabble.
Unscramble IONOR, ROOIN or OINOR and you get the same 5 letters as OIRNO: so the words from OIRNO listed below are the words from those scrambles too.
inro, iron, noir and 6 others tie for the highest Scrabble score from oirno at 4 points. The top 10 of 15 words are shown here, with the full list organized by length below.
The highest-scoring plays from these letters are inro, iron, noir, and nori, worth 4 points in Scrabble, and nothing else built from oirno earns more points in Scrabble. Words With Friends prices the same letters differently, so the top of the list changes on a Words With Friends board. Both scores count tile values only and exclude premium squares.
The letters in oirno produce 15 valid words in the Scrabble and Words With Friends dictionaries. The word count by length is: 4 four-letter words, 6 three-letter words and 5 two-letter words.