Words Starting With IS

What Are IS Words?

Words starting with IS are English words that begin with the letters IS. This collection spans from the ubiquitous verb "is" to specialized terms like "ischiococcygeal," drawing heavily from the Greek prefix "iso-" meaning equal or same, as well as Old English roots found in words like "isle" and "island." With 655 total entries, the list offers a diverse range of vocabulary where the most common word length is 9 letters, accounting for 16.5% of the total. These words often denote concepts of equality, isolation, or specific geographical and anatomical features. The prefix "iso-" appears frequently in scientific and mathematical terminology, while other entries like "islam" and "isaac" reflect significant cultural and historical origins. The average Scrabble value for these words is 14.3, slightly lower than the dictionary average of 15.5, indicating a balanced mix of high-value and common letters.

Statistical Profile: Words Starting With IS

• Total words: 655 words start with IS
• Dominant length: 9 letters (16.5% of IS-words)
• Average Scrabble score: 14.3 points — below the dictionary average of 15.5
• Common words: 2% of IS-words appear in everyday English (vs. 3.2% average across all prefixes)
• Most common third letter: After IS, the most frequent next letter is O (443 words)

Common IS Words

These are the most recognizable words starting with IS:

is, iso, ist, isle, isaac, islam, issue, island, israel, islamic, israeli, isolated, isolation

Using IS Words in Word Games

When playing Scrabble or other word games, words starting with IS provide strategic opportunities due to their moderate average score of 14.3 points, which is slightly below the dictionary average of 15.5. Players should prioritize 9-letter words, as they represent the most common length at 16.5% of the list and often fit well on premium board squares. While common short words like "is" and "ist" are useful for quick plays, aiming for longer terms like "issue" or "island" can maximize point potential without requiring overly obscure vocabulary.

Highest-Scoring IS Words

Scrabble

1. ischiococcygeal — 30 points
2. isobathythermic — 30 points
3. isohydrocyanic — 28 points
4. isobathythermal — 28 points
5. isoimmunization — 28 points

Words With Friends

1. ischiococcygeal — 34 points
2. isoimmunization — 33 points
3. isobenzofuran — 31 points
4. isosulphocyanic — 31 points
5. isobathythermic — 30 points

Word Unscrambler

Need to find words from specific letters? Use our full Word Unscrambler tool right here.

Related Prefixes

IA WordsIB WordsIC WordsID WordsIG WordsIL WordsIM WordsIN WordsIO WordsIP WordsIR WordsIT WordsIV Words

Browse by Word Length

2-Letter Words3-Letter Words4-Letter Words5-Letter Words6-Letter Words7-Letter Words8-Letter Words9-Letter Words10-Letter Words11-Letter Words12-Letter Words13-Letter Words14-Letter Words15-Letter Words

Frequently Asked Questions

How many words start with IS?

There are 655 valid words starting with IS. This comprehensive list includes everything from common daily terms to highly specialized vocabulary. The collection is curated to ensure every entry is recognized in standard English dictionaries.

What is the best Scrabble word starting with IS?

ischiococcygeal scores 30 points. This 15-letter anatomical term is the highest-scoring option available in the list for competitive play. While difficult to place, it offers a massive point boost if you can utilize premium squares effectively.

Is this word list free?

Yes, completely free. No account needed. Runs entirely in your browser.