Afghanistan
Australia is sometimes informally referred to as Oz, derived from the last syllable of the name Australia.
Population is stressed on the third syllable. A simple way of testing which syllable is stressed is by saying the word aloud. Look for the syllable that you naturally emphasise more in your speech.
Peru is a South American country with a name that is 4 letters long.
Afghanistan
Australia.
A 4 syllable word is a word with 4 syllables:)
Acquainted is a three syllable word.
Badger (2)ungenerous (4)
4
in the first syllable
4
4
4
4
4.
4
4