Use Your Dictionary

I find a dictionary helpful when studying the Bible.  When two words sound like they have similar meaning, I look them up.  I use Webster's Seventh New Collegiate Dictionary, published by G. & C. Merriam Company, Springfield, Mass. 1965

Abide--to accept without objection, to remain stable or fixed in a state, to continue in a place.
Rest--freedom from activity, to cease from action or motion
To me, "abide" means to choose to stay where you are.  "Rest" means to choose to cease from activity.  We abide in Jesus the vine and in God's hands, but we won't have complete rest until we get to heaven.

Sin--an offense against God, transgression of the law of God, to commit an offense or fault.
Iniquity--gross injustice.
Transgression--to violate a command or law.
To me, "iniquity" is choosing to do something completely unfair to someone else, like a con man lying to a person to steal money from them.
"Transgression" is what you might call a "dead end" sin.  Like driving over the speed limit.  It may not even be intentional, but no one cares enough to sort out the truth of it.
"Sin" covers both "iniquity" and "transgression".

Prophecy--an inspired utterance of a prophet, declaration of something to come, prediction.
Prophesy--to speak as if divinely inspired to give instruction in religious matters, to make a prediciton.
The difference between these, is "prophecy" is a noun and "prophesy" is a verb. Prophets not only spoke predictions, but also pointed out things that were still happening, like idol worship.

Here are some more words worth looking up:
Light/lamp
Faith/hope
Worship/praise/thankful