rooster

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US /ˈruː.stɚ/ 
UK /ˈruː.stər/ 

Longman Dictionary of Contemporary English

rooster

rooster /ˈruːstə $ -ər/ noun [countable]
a male chicken SYN cock British English

Oxford Advanced Learner's Dictionary

rooster

roost·er [rooster roosters]   [ˈruːstə(r)]    [ˈruːstər]  (especially NAmE) (BrE also cock) noun
an adult male chicken
compare  hen
See also: cock
 

Cambridge Advanced Learner's Dictionary

rooster

rooster /ˈruː.stəʳ/ US /-stɚ/
noun [C]
US FOR cock (BIRD)

 

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cock

cock (BIRD) /kɒk/ US /kɑːk/
noun [C] (US ALSO rooster)
1 an adult male chicken:
The cock started to crow.

2 used with the name of a bird to refer to the adult male of that type:
a cock robin
a cock pheasant