This is the 6234th most frequent Turkish word.
çiçeği
"Çiçeği" means "the flower" in English.
Here, 'çiçeği' is the noun 'flower' in its accusative form, used as the direct object of the verb 'suladım'.
Bahçedeki çiçeği suladım.
I watered the flower in the garden.
In this sentence, 'çiçeği' is again an accusative form indicating the direct object of the verb 'beğendi'. It also specifies which flower: the new one.
Arkadaşım yeni çiçeği çok beğendi.
My friend really liked the new flower.
Here, 'çiçeği' serves as the direct object of the verb 'korumaya çalışıyoruz', denoting the thing being protected.