Correctly spelled word: Paralleled

Explanation:
The correct spelling of the word is "Paralleled". Let's break down the word and examine each part.

1. Prefix: "Para-"
The prefix "para-" means "beside" or "alongside". It is commonly used in words related to comparison or similarity.

2. Root word: "Parallel"
The word "parallel" is an adjective that means two or more lines or objects that are always the same distance apart and never meet. It can also be used as a noun or a verb.

3. Suffix: "-ed"
The suffix "-ed" is added to the root word to form the past tense or past participle of a verb. In this case, it indicates that something has been done in the past or completed.

Putting all the parts together, "paralleled" means that something has been made parallel or placed alongside in a comparable or similar manner.

- "Parallelled" does not exist as a word. It is an incorrect spelling.
- "Parralleled" is also an incorrect spelling. The correct spelling of the word "parallel" does not have double "r".
- "Paralleledd" is also an incorrect spelling. The suffix "-ed" is only added once to form the past tense.

Conclusion:
The correct spelling of the word is "Paralleled". It is important to pay attention to the correct spelling of words to effectively communicate in written language.