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13 Letter Words Starting With ON

There are 32 valid 13 letter words that start with ON, drawn from NWL2023, CSW24, and Words With Friends. Sorted below by score, with the single highest scorer called out.

Highest Scoring 13-Letter Words

US Scrabble (NWL)

onchocercosis - 22 points

UK Scrabble (CSW)

onchocercosis - 22 points

Words With Friends

onchocercosis - 25 points

13 Letter Words (32)

View all words starting with ON

Top 20 Highest-Scoring 13 Letter Words Starting With on

Point values shown for US Scrabble, UK Scrabble, and Words With Friends. The average across this full 32 word list is 55.5 combined points.

Rank Word US Scrabble UK Scrabble WWF Points Total
🏆 #1 onchocercosis 22 22 25 69
#2 oneirocritics 17 17 20 54
#3 oneiromancers 17 17 21 55
#4 oneiromancies 17 17 21 55
#5 oneiroscopies 17 17 20 54
#6 oneiroscopist 17 17 20 54
#7 onerousnesses 13 13 16 42
#8 ongoingnesses 15 15 20 50
#9 onomastically 20 20 24 64
#10 onomasticians 17 17 21 55
#11 onomatologies 16 16 20 52
#12 onomatologist 16 16 20 52
#13 onomatophobia 22 22 25 69
#14 onomatopoeial 17 17 21 55
#15 onomatopoeian 17 17 21 55
#16 onomatopoeias 17 17 20 54
#17 onomatopoeses 17 17 20 54
#18 onomatopoesis 17 17 20 54
#19 onomatopoetic 19 19 23 61
#20 ontogenetical 16 16 21 53

Where 13 Letter Words Fit on the Board

At 13 letters, a word almost always uses your entire rack plus tiles already on the board these are realistically bingo-adjacent plays rather than everyday moves, which is why the list leans heavily on compound and suffixed forms (-nesses, -ation, -izing). If you're looking for words you can play more often, shorter lengths starting with ON will give you far more flexible options try 13 letter words starting with ON for a more practical middle ground.

Frequently Asked Questions

What is the highest-scoring 13 letter word starting with on?

onchocercosis — worth 69 combined points (US Scrabble: 22, UK Scrabble: 22, Words With Friends: 25).

How many 13 letter words start with on?

32 valid words, combining entries from NWL2023, CSW24, and the Words With Friends dictionary.

Are 13 letter words realistic to actually play?

Only occasionally — you'd need most of your rack plus letters already on the board to reach 13 tiles. They're worth knowing for the rare bingo-extension play, but for regular turns, shorter on words will come up far more often.