Instructor vs Professor

When to use each in English, with meaning, register, and examples.

Instructor

Top 2,000 (common) A2 noun

Professor

Formal Top 2,000 (common) A2 noun

Most formal: Professor

	Instructor	Professor
Pronunciation	🇬🇧 /["/ɪnˈstrʌktə(r)/"]/ 🇺🇸 /["/ɪnˈstrʌktər/"]/	🇬🇧 /["/prəˈfesə(r)/"]/ 🇺🇸 /["/prəˈfesər/"]/
Meaning	A person who teaches something.	A teacher at a college or university.
Example	a fitness/driving/ski instructor	The professor gave a fascinating lecture on ancient history.
Register	Neutral	Formal
How common	Top 2,000 (common)	Top 2,000 (common)
CEFR level	A2	A2
Part of speech	noun	noun
Collocations	certified, qualified, trained, teach somebody/​something	distinguished, eminent, respected, professor of, distinguished, eminent, respected, professor of
Antonyms	student, learner	student, learner
Common mistakes	Confused with 'facilitator' but an instructor directly teaches., Using 'instructor' for non-teaching roles., Believing 'instructor' can be used interchangeably with 'teacher' in all contexts.	Confused with 'teacher' — 'teacher' is more general and can refer to any level of education., Using it incorrectly in plural form — 'professors' instead of 'professor' when it's a general reference.
Usage notes	Use 'instructor' in formal or educational contexts, such as schools or training programs. Avoid using it in casual conversations unless discussing teaching or training.	Use 'professor' in academic and serious contexts. Avoid using it in casual or informal conversations about non-academic individuals.

See it in real clips

Professor Brand.

Breaking Bad › S1 E5

And you remember the professor who used to hate Robert Wilhelm Bunsen?

Professor Brand.

Breaking Bad › S1 E5

And you remember the professor who used to hate Robert Wilhelm Bunsen?

Professor

Frequently asked questions: Instructor vs Professor

What's the difference between Instructor and Professor?

Instructor: A person who teaches something. Professor: A teacher at a college or university.

Which is more formal: Instructor and Professor?

Professor is the most formal of these.

Are Instructor and Professor the same CEFR level?

Instructor: A2, Professor: A2 on the CEFR scale.

What part of speech are Instructor and Professor?

Instructor: noun, Professor: noun.

Can you show an example of each?

Instructor: a fitness/driving/ski instructor Professor: The professor gave a fascinating lecture on ancient history.

Can I use Instructor and Professor interchangeably?

Not always. Instructor and Professor 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.