Cool MateFulfill vs Realize
When to use each in English, with meaning, register, and examples.
Fulfill
Top 2,000 (common)B1
Realize
Top 1,000 (very common)A2verb
Most common: Realize
| Fulfill | Realize | |
|---|---|---|
| Pronunciation | 🇬🇧 //fʊlˈfɪl//🇺🇸 //fʊlˈfɪl// | 🇬🇧 /["/ˈriːəlaɪz//ˈrɪəlaɪz/","/ˈriːəlaɪzɪz//ˈrɪəlaɪzɪz/","/ˈriːəlaɪzd//ˈrɪəlaɪzd/","/ˈriːəlaɪzɪŋ//ˈrɪəlaɪzɪŋ/"]/🇺🇸 /["/ˈriːəlaɪz/","/ˈriːəlaɪzɪz/","/ˈriːəlaɪzd/","/ˈriːəlaɪzɪŋ/"]/ |
| Meaning | To do what is required or promised. | To understand something clearly. |
| Example | She worked hard to fulfill her dreams. | I didn't realize how important that meeting was until it was too late. |
| Register | Neutral | Neutral |
| How common | Top 2,000 (common) | Top 1,000 (very common) |
| CEFR level | B1 | A2 |
| Part of speech | verb | |
| Collocations | fulfill a dream, fulfill a promise, fulfill a requirement, fulfill one's duties | fully, dimly, suddenly, begin to, come to, make somebody, with, without realizing (something) |
| Antonyms | neglect, disappoint, fail | ignore, overlook, miss |
| Common mistakes | Confused with 'fill' — remember they mean different things., Using it without an object is incorrect; you always need to say what you fulfill., Often misspelled as 'fulfil' without the second 'l' in American English. | Confusing 'realize' with 'realised' in British English., Using 'realize' without an object (e.g. 'I realized that' is correct)., Mixing up 'realize' with 'recognize'; they have different meanings. |
| Usage notes | Used in formal and everyday contexts. It's appropriate when discussing commitments, expectations, or requirements. | Use 'realize' when you come to a new understanding or awareness of something. It's neutral and suitable for both spoken and written contexts. Avoid using it in very formal writing where 'become aware of' might be preferred. |
Frequently asked questions: Fulfill vs Realize
What's the difference between Fulfill and Realize?
Fulfill: To do what is required or promised. Realize: To understand something clearly.
Which is more common: Fulfill and Realize?
Realize is the most common in everyday English.
Are Fulfill and Realize the same CEFR level?
Fulfill: B1, Realize: A2 on the CEFR scale.
Can I use Fulfill and Realize interchangeably?
Not always. Fulfill and Realize are related and overlap in some contexts, but they differ in register, how common they are, and usage, so swapping one for another can change the meaning or tone. Check the differences above before substituting.