Farewell vs Say bye-bye

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

Farewell

Top 5,000 (fairly common)

Say bye-bye

Informal Beyond 10,000 (less common)

Most formal: Farewell Most common: Farewell

	Farewell	Say bye-bye
Pronunciation	🇬🇧 //fɛəˈwɛl// 🇺🇸 //fɛrˈwɛl//	🇬🇧 //seɪ baɪ baɪ// 🇺🇸 //seɪ baɪ baɪ//
Meaning	A way to say goodbye.	To say goodbye
Example	She waved a heartfelt farewell as the train departed.	She waved and said bye-bye to her friends.
Register	Neutral	Informal
How common	Top 5,000 (fairly common)	Beyond 10,000 (less common)
Collocations	bid farewell, say farewell, farewell party	say bye-bye, wave bye-bye, tell someone bye-bye, shout bye-bye, say bye-bye playfully
Antonyms	greeting, welcome	-
Common mistakes	Used too casually in everyday settings., Confused with 'farewell' as a noun and verb., Overused when a simple 'goodbye' would suffice.	Using in formal situations where 'goodbye' is more appropriate., Saying 'say bye-bye' instead of just 'bye-bye'., Confusing with other phrases like 'see you later'.
Usage notes	Use 'farewell' in formal situations or when parting for a long time. It's less common in casual conversations.	Used casually, often among friends or in playful contexts. Avoid in formal settings or serious goodbyes.

See it in real clips

The Lord Of The Rings › The return of the king

Farewell, Peregrin, son of Paladin.

The Lord Of The Rings › The Fellowship Of The Ring

I bid you all a very fond farewell.

The Lord Of The Rings › The return of the king

Farewell, Peregrin, son of Paladin.

The Lord Of The Rings › The Fellowship Of The Ring

I bid you all a very fond farewell.

Farewell

WOMAN: That's enough, kids. Say bye-bye.

Say bye-bye

Frequently asked questions: Farewell vs Say bye-bye

What's the difference between Farewell and Say bye-bye?

Farewell: A way to say goodbye. Say bye-bye: To say goodbye

Which is more formal: Farewell and Say bye-bye?

Farewell is the most formal of these.

Which is more common: Farewell and Say bye-bye?

Farewell is the most common in everyday English.

Can you show an example of each?

Farewell: She waved a heartfelt farewell as the train departed. Say bye-bye: She waved and said bye-bye to her friends.

Can I use Farewell and Say bye-bye interchangeably?

Not always. Farewell and Say bye-bye 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.