Many learners get confused between “thier” and “their.” These words look almost the same, and the letters are just in a different order. Because of this, spelling mistakes are very common.
The good news is simple: only one of these is correct.
Quick Answer
- Their = correct spelling
→ shows possession (something belongs to them) - Thier = incorrect spelling
→ a common mistake
Simple Background
The word “their” is a possessive word used in English to show that something belongs to a group of people.
The spelling “thier” comes from mixing up the letters “ie” and “ei,” which is a common problem in English spelling.
Clear Explanation of the Difference
What is “Their”?
Their is the correct word.
It means:
- Something belongs to them
Examples:
- “Their house is big.”
- “They finished their work.”
What is “Thier”?
Thier is:
- Not a correct English word
- A spelling mistake
❌ “Thier car is new.”
✔ “Their car is new.”
Comparison Table
| Word | Type | Meaning | Correct Usage |
|---|---|---|---|
| Their | Possessive | Belonging to them | ✅ Yes |
| Thier | Incorrect | No meaning | ❌ No |
Which One to Use and When
Always use their when:
- You want to show ownership
- Something belongs to people or a group
Never use thier in correct writing.
Simple Tip to Remember
- Their = contains “heir” (someone who owns something)
Think:
Their → heir → owner
Common Mistakes People Make
1. Reversing letters
❌ “thier”
✔ “their”
2. Confusing with other similar words
People also mix it with “there” and “they’re.”
3. Typing too fast
Mistakes happen when writing quickly.
Everyday Real-Life Examples
In Emails
- “Their report is ready.”
In Messages
- “I like their idea.”
On Social Media
- “Their team won!”
In Daily Life
- “Their children are playing.”
- “This is their house.”
Short Learning Section for Students
Here is a simple way to remember:
Step 1: Learn the correct form
- Their = correct
- Thier = wrong
Step 2: Practice
- “Their book is here.”
- “Their teacher is kind.”
Step 3: Use memory trick
Think:
Their = heir (owner)
Step 4: Check spelling
Always look at the order: t-h-e-i-r
FAQ Section
Is “thier” ever correct?
No, it is always incorrect.
Why do people write “thier”?
Because they confuse “ie” and “ei.”
What does “their” mean?
It shows that something belongs to them.
Is this mistake common?
Yes, very common among learners.
How can I remember easily?
Think: their = heir = owner.
Should I worry about this in exams?
Yes, spelling mistakes can reduce marks.
Is “their” used often?
Yes, it is a very common word.
Conclusion
The difference between thier and their is very simple.
- Their is the correct spelling and shows possession.
- Thier is a common spelling mistake.
Remember this one rule:
Always write “their” in the correct order: t-h-e-i-r.
With this, you will never make this mistake again.
Chase Dominic is a contributing author at GrammerPeak, dedicated to making English grammar simple and practical. His writing focuses on clear explanations, real-world examples, and common error correction, helping readers strengthen sentence structure, improve accuracy, and communicate confidently in academic, professional, and everyday English contexts.
