Slightly different to synonymous parallelisms, the Bible and Book of Mormon contain many examples of repetition of synonymous words.
One example from the Book of Mormon is found in Alma 30:28:
and have brought them to believe,
by their traditions
and their dreams
and their whims
and their visions
and their pretended mysteries
Another example is found in Alma 63:2:
And he was a just man,
and he did walk uprightly before God;
and he did observe to do good continually,
to keep the commandments of the Lord his God
Wouldn’t we expect Joseph Smith to have struggled to find such synonymous words to describe the same things?