The term paraphrase in music seems quite clearly defined.
Right coming from searching another term for the fill-ins, echo-ing, answering in a musical dialog of 2 instruments, a singer and piano or guitar, I proposed the term "paraphrasing". Now I've found paraphrasing used in of other answers and comments.
I'm not sure whether there is evidence for a definition of "paraphrizing". If yes, thank you for answering.