Innuendo and Whispering campaign

Innuendo noun - A slyly or subtly derogatory remark.

Whispering campaign and innuendo are semantically related In some cases you can replace phrase "Whispering campaign" with "Innuendo", this terms are similar.

Whispering campaign noun - The organized dissemination of derogatory rumors designed to discredit a candidate.

Innuendo and whispering campaign are semantically related in negative campaign topic. You can use "Innuendo" instead a noun phrase "Whispering campaign".