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13-Letter Words Starting With IS

  • 33 words
  • All English dictionaries
  • Scrabble points
Dictionary

Popular 13-Letter Words Starting With IS

The most familiar words on this list, with their Scrabble scores.

All 13-Letter Words Starting With IS 33 words

How common is IS at the start of thirteen-letter words?

Our combined English word list has 33 thirteen-letter words that start with IS. They average 19 points, the best is ISOCARBOXAZID (34 points) and 42.4% end in S.

Total words
33
Average Scrabble score
19
out of 34 max
Everyday words
0%
common in ordinary English
Most common ending
S
42.4% of words

Most common last letters

  • s 42.4%
  • y 15.2%
  • c 9.1%

Top vowel pairs

  • io12.1%
  • ie9.1%
  • oa9.1%

Share of words where these two vowels sit side by side.

Rare words worth knowing

Valid in this dictionary but rarely seen in everyday English.

Highest-scoring thirteen-letter word that starts with IS

i 1s 1o 1c 3a 1r 1b 3o 1x 8a 1z 10i 1d 2

I 1 + S 1 + O 1 + C 3 + A 1 + R 1 + B 3 + O 1 + X 8 + A 1 + Z 10 + I 1 + D 2 = 34 points

Double word
68 pts
Triple word
102 pts

Face value of the tiles, then the whole word on a double- or triple-word square (letter bonuses and bingos not included).

isocarboxazid

  1. nouna monoamine oxidase inhibitor (trade name Marplan) that is used to treat clinical depression
  • Scrabble US
  • Scrabble UK
  • Words With Friends

Runners-up

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13-letter words starting with…

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Words starting with IS by length

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Playing words that start with IS

13-Letter Words Starting With IS by the numbers

13-Letter Words Starting With IS FAQ

How many thirteen-letter words that start with IS are there?

There are 33 thirteen-letter words that start with IS in our combined English word list. Other dictionaries give different totals, so switch dictionary at the top of the list to compare.

What is the highest-scoring thirteen-letter word that starts with IS?

ISOCARBOXAZID is worth 34 points in Scrabble before any bonus squares. Other strong options are ISOALLOXAZINE (29), ISOCHRONIZING (28), ISOMERIZATION (24).

Which rare thirteen-letter words that start with IS score well?

Uncommon but valid choices include ISOCARBOXAZID (34), ISOALLOXAZINE (29), ISOCHRONIZING (28), ISOMERIZATION (24). Few players know them, so they can catch an opponent off guard.