Trick or treat—today's synonym is pretty sweet! The noun treat is used to refer to anything that affords particular pleasure or enjoyment. On Halloween, treat, of course, means candy! After accumulating a sufficient amount of treats, a pint-sized caped crusader or ferocious jungle cat might spend some time admiring their goodies. The word goody (also spelled goodie) is almost always used in the plural to refer to things especially tasty or pleasing. Something that stands the test of time, as classic song or TV episode, might be called an oldie but a goodie, and a bag of gifts given to guests at an event or party is a goody (or goodie) bag.
An avocation is something a person does in addition to a principal occupation, especially for pleasure. In its earliest uses, avocation referred to a calling away or diversion, as from a more important or serious task, function, or duty. The suggestion of being called away persists in modern usage. A person’s vocation (“occupation or profession”) might be accounting, but they may feel called to paint. Should they do so in their free time, painting would be their avocation.
When desires, expectations, or needs are satisfied, they are fulfilled. A hearty meal might satisfy one's appetite (nice and simple!). The verb appease is used a little differently: to appease someone is to calm, pacify, or soothe them. The core idea behind appease is that of preserving or obtaining peace, but the term is not without conflict: sometimes appease suggests making anxious overtures or undue concessions, perhaps at the expense of what one feels is right, to satisfy demands of powerful people or entities.