coo
/ku/noun, verb, interjection, adjective
coo is spelled C-O-O: 3 letters and one syllable. It appears 2.0 times per million words in written English, the 19,589th most frequent word form (wordfreq, 2021 data). As a noun, coo means “The murmuring sound made by a dove or pigeon” (English Wiktionary, September 2026). The plural of coo is coos.
How many letters and syllables are in coo?
| Letters | 3: C-O-O |
|---|---|
| Syllables | 1 |
| In writing | 2.0 times per million words; the 19,589th most frequent word form |
| Wrong spellings searched | none measured in search |
| Pairs people search | |
| Sounds like | |
| Rhymes with |
Sources: letters and syllables from the English Wiktionary's hyphenation or pronunciation; written frequency: wordfreq 3.1 (a 2021 snapshot of Wikipedia, subtitles, news, books, web text and social media); Bing searches in the United States: the average month from September 2025 to August 2026 (Microsoft Advertising keyword data through DataForSEO, read September 30, 2026); rhymes and same-letter words are computed by PlainSpell from its own word list.
How common is coo?
Coo appears 2.0 times per million words in written English, the 19,589th most frequent word form in the list.
Source: written frequency: wordfreq 3.1 (a 2021 snapshot of Wikipedia, subtitles, news, books, web text and social media).
How do you pronounce coo?
- UK /kuː/
- US /ku/
Coo has one syllable.
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract). Recordings: LL-Q1860_(eng)-Vealhurl-coo.wav, Wikimedia Commons (author and licence on each file's page).
Words people confuse with coo
Word pairs people search, with the monthly searches for “a vs b” (G: Google, B: Bing, United States).
Sounds like: coup (Wiktionary's homophone list; some hold only in some accents).
Sources: Google and Bing searches (September 2025 to August 2026, through DataForSEO); English Wiktionary (homophones, alternative spellings).
What rhymes with coo?
The 12 most written words on PlainSpell end in the same sounds as coo from its last stressed vowel (/u/):
Computed by PlainSpell from the pronunciations in the English Wiktionary (dump of September 2, 2026): a rhyme shares every sound from the last stressed vowel to the end; ordered by written frequency (wordfreq 3.1).
Forms of coo
- coos plural, present, singular, he/she/it
- cooing participle, present
- cooed participle, past
- more coo comparative
- most coo superlative
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).
What does coo mean?
The meanings the English Wiktionary records, quoted as written there (source below).
noun
- 1
The murmuring sound made by a dove or pigeon.
- 2
An expression of pleasure made by a person.
verb
- 1
To make a soft murmuring sound, similar to a dove or pigeon.
- 2
To speak in an admiring fashion, to be enthusiastic about.
interjection
- 1
An expression of approval, surprise, etc.
noun
- 1
Initialism of chief operating officer.
- 2
Initialism of country of origin.
adjective
- 1
slangPronunciation spelling of cool.
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).
Coo in Spanish, French, German and Portuguese
| Language | Words |
|---|---|
| French | roucoulement , roucouler |
| German | Gurren, Girren , girren, gurren, rucksen, turteln |
| Portuguese | arrulho , arrulhar |
| Spanish | arrullo , arrullar |
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract). Translations are Wiktionary's, by sense; a linked word has its own PlainSpell page.
Where does coo come from?
Onomatopoeic. Compare Dutch koeren.
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).