This is the 252nd most frequent Japanese word.
チキン
"チキン" means "chicken" in English.
In this sentence, チキン refers to the food item made of chicken meat.
私は晩ご飯にチキンを食べました。
I had chicken for dinner.
In this sentence, チキン is used metaphorically, borrowing the English usage of 'chicken' to mean a coward.
彼は新しいことを試すのが怖いと言って、私は彼に「チキンにならないで」と言いました。
He said he was scared to try new things, so I told him, 'Don't be a chicken.'
Here, チキン is again used to indicate a food product, specifically frozen chicken meat.