- grapevine, pipeline, word of mouth - gossip spread by spoken communication; "the news of their affair was spread by word of mouth"
--1 is a kind of gossip, comment, scuttlebutt
- pipeline, line - a pipe used to transport liquids or gases; "a pipeline runs from the wells to the seaport"
--2 is a kind of pipe, pipage, piping
--2 has particulars: Alaskan pipeline, trans-Alaska pipeline; gas line; oil pipeline