This is the 3426th most frequent Turkish word.
kuşu
"Bird" (possessive form: "his/her/its bird").
Here, 'kuşu' means 'the bird,' where the accusative case indicates the direct object being acted upon in the sentence.
Bahçede bir kuşu izliyorum.
I am watching a bird in the garden.
Here, 'kuşu' refers to 'his/her bird,' as the third-person singular possessive suffix '-u' is attached to 'kuş'.
Küçük bir çocuğun kuşu kaybolmuş.
A small child's bird is lost.
In this sentence, 'kuşu' is a noun meaning 'kite' in informal language, reflecting a different meaning based on the context.