DAY ONE: Scimitar - a long curved sword used in ancient warfare.DAY TWO: Churn - to bubble or ferment. It can also mean the tub or barrel that is used to make butter.
DAY THREE: Contribution - to give money or other resources for the purpose of helping. A synonym is DONATION.
DAY FOUR: Unaccustom - to NOT be used to something. It is the opposite of accustom which means to be familiar or used to something.