AThe word "divine"

I learned a new word "divine".

(iIn an online English class) ¶
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I feel that "divine" is a very powerful and word, which givebrings me a kind of relinquishment.

On the other hand, it sometimes gives me ease, which givetells me what I should do, leaving nothing confusiong.

I wonder if I was able to tell you an ambiguous thing mentioned above.

The grammar is correct but I don't quite understand the meaning of this sentence

AThe word "divine"

When speaking of one thing that is singular, the word "the" is better to use because it is specific.

I learned athe word "divine".

Same reason as before.

Though I've learned a plenty of English words, this is my first time seeing this word.

If you say "a plenty", it implies plenty is a noun. The way you used the "plenty" here would make it a pronoun, so you can just say "...learned plenty of".

(in online English class) ¶
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I feel that "divine" is a very powerful and word, which gives me a kind of relinquishment.ing feeling.

You would remove the word "and" between "powerful" and "word" because using "and" implies that the words "powerful" and "word" are part of two different ideas.

Relinquishment is a noun. I reworded the sentence so you can still use the word you wanted to use, just in a different form.

On the other hand, it can sometimes gives me a sense of ease, which givuides me what I should doand leavinges nothing confusingunknown to me.

For "gives me ease": the way this was worded read like you were being given a physical object, so I altered the wording so it was clear.
For the rest of the sentence, I think I understood what you meant. The wording and sentence structure was mostly incorrect, so I reworded your idea in a proper format it in the way that I understood it.

I wonder if I was able to tell you ancommunicated the ambiguous thing that I mentioned above.

Here, "an" is changed to "the" here because "the" is for singular and specific things.
I changed "was able to tell you" to "communicated" for a few reasons:
1. "I wonder if I was able to tell you..." is a tad bit wordy for what you were trying to say. It also seems like you are insecure in your ability.
2. The word "communicated" gets the point across in one word and means the same as what you were saying in the original text.