The best way I can ask this question is algebraically: "word is to synonym as sentence is to X"...what is X?
I'm looking for the name of the concept where two different sentences convey the same idea.
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Rephrasing, from TFD:
tr.v. re·phrased, re·phras·ing, re·phras·es
To phrase again, especially to state in a new, clearer, or different way.
Rewording, from TFD:
tr.v. re·word·ed, re·word·ing, re·words
a. To change the wording of.
b. To state or express again in different words.
A paraphrase is a restatement of text using other words.