The Penguin Rhyming Dictionary by Rosalind Fergusson is easy to use. To find the rhymes for any particular word, first look in the index, which forms roughly the second half of the book. The index will refer you either to a group number (e.g. 15) or a subgroup number (e.g. 15.3) in the first part of the book. And that's it, - rhyme along! The book contains lists of rhymes for well over 40000 words, and even offer explanations of the unusual ones. For instance: I was desperately looking for a rhyme for the word disequilibrium, and yes, here it was: Perionychium, explained as skin surrounding fingernail. I'll find a way to make use of this in a song, sooner or later. But, of course, there are several more relevant words for songwriters: 11 rhymes for love, - even Baal Shem Tov (Jewish religious leader!). I don't regret I also ordered a copy for a friend.