Good fun, and good/interesting ideas, but too many (three out of four) word play/word alteration links and one very obscure entry (atta). Can't tell if it was well constructed or not. Two red herring groups, and so many red herrings for each link mean I can't be bothered to work out whether there are swappable answers. Solved by luck rather than skill.

Attar??

@ Chris Ditchfield. It's a real word, and I saw it eventually (actually what gave the link away to me) but it's so obscure,I was really dredging my brain to get it.