fu

Name: fu, English Word Data
Creator: Wiktionary
License: https://creativecommons.org/licenses/by-sa/4.0/

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By PlainSpell Editorial Team · According to Wiktionary data (CC BY-SA) · analyzed May 6, 2026

The verdict

“fu” is a regularly-used English word, ranked #8,543 in English word frequency and used as an interjection.

#8,543
frequency rank, English: 2
letters: 20
confusable pairs

According to Wiktionary data (CC BY-SA, analyzed May 6, 2026) - Initialism of fuck you.

Visual similarity to commonly confused words

How many letter changes separate each confused pair (Levenshtein distance, normalized).

fu vs FW

0% similar

fu vs fy

50% similar

fu vs fun

67% similar

Source: PlainSpell confusable corpus (Wiktionary, CC BY-SA).

Key facts for fu
Property	Value
Headword	fu
Language	English
Part of speech	Interjection
Letters	2
Frequency rank	#8,543
Misspellings tracked	0
Confusable pairs	20
Source	Wiktionary (kaikki.org)

Where “fu” sits in English frequency

Every-word frequency runs from the handful of words we use constantly (left) to the long tail used once in a blue moon (right). fu lands here:

#8,543

#1#100#1K#10K#100K

← used constantlyrarely used →

Scale is logarithmic (each tick is 10× rarer). Source: FrequencyWords open word-frequency list.

Spelling & Dictionary Insight

The English entry for fu is 2 letters long, classified as an interjection. Corpus data places it at rank #8,543 in overall English word frequency, indicating it appears regularly in written and spoken text. The dominant gloss from Wiktionary reads: "Initialism of fuck you.".

No misspelling variants are generated for fu in our index, and the word's spelling is regular enough that our generator found nothing worth flagging. It also participates in 20 confusable-pair relationships, "FW", "fy", "fun", and more, a pairing that trips writers up because the two words share enough sound or shape to blur together.

Etymologically, the entry records: From fuck + you. The correct English form is fu, spelled F-U.

Definition

1
Initialism of fuck you.

Etymology

From fuck + you.

Definitions, pronunciation, and etymology for this entry are drawn from Wiktionary via the kaikki.org structured extract (CC BY-SA); frequency ordering uses the FrequencyWords open word-frequency list (2018 English corpus, MIT). See the methodology for how each field is sourced and updated.

Frequently Asked Questions

How do you spell "fu"?

"fu" is spelled F-U.

What does "fu" mean?

As an interjection, "fu" means: Initialism of fuck you.

What words are commonly confused with "fu"?

"fu" is commonly confused with "FW", "fy", "fun". These words look or sound similar but have different meanings. PlainSpell provides detailed comparisons for each pair.

What is the origin of the word "fu"?

From fuck + you. See the full etymology section above for more details.

Is PlainSpell free to use?

Yes, PlainSpell is a completely free word reference. You can look up definitions, pronunciations, confusable pairs, homophones, and spelling corrections across 5 languages without any sign-up or subscription.

Using “fu”

The practical upshot for anyone who landed here from a spell-check.

The one correct English spelling is F-U - every other letter order is a misspelling in standard orthography.
Don't mix it up with “FW” - see the side-by-side comparison. fu vs FW
Browse more English words and confusable pairs in the same reference. English words

Data Source

Wiktionary (via kaikki.org), licensed under CC BY-SA & GFDL. Word ordering uses an open word-frequency list; misspelling variants are generated by edit-distance from the correct headword.