Perhaps the 2007 edition (The Penguin Pocket Rhyming Dictionary (Dictionary, Penguin))really is new and improved, more streamlined and better structured, but this quarter century old edition shows its age.
First of all, it tries to mimic the old New American Roget's College Thesaurus in Dictionary Form (Revised & Updated) (Signet Reference) as we must look up our word to rhyme in the second half of the book to find its category, which is divided and subdivided much like Roget did his book of synonyms. This is quite cumbersome when compared with other rhyming dictionaries, including the excellent Merriam-Webster's Rhyming Dictionary, and perhaps (I do not know) is improved in Penguin's new 2007 edition.
I should not judge this book by today's standards, certainly, and I should not have tried to get this book on the cheap by purchasing the older edition. Much of the words are now archaic; there is much that is British dialect, and much of the rhymes are based on particular British usages which do not ring true upon our shores, not even as "slant rhyme."
Te fact that half of the book is a book list, and the other half categories means less room for an extensive list; in fact there are fewer entries in this book than in others. The fact it is so old, from the early days of PC's and of "mainframes" means the editor, Rosalind Ferguson, can write breathlessly of their wondrous service to the lexicon craftsman:
"To compile the Penguin Rhyming Dictionary, a list of words together with their phonetic transcriptions was extracted from a standard dictionary data base. The computer was programmed to sort these words, working from the end of the phonetic transcription back to the beginning, into phonetic order. Unsuitable and unrhymable words were then discarded and the remainder of the list was sorted into rhyming groups. The result it (sic) that homophones (phonetically identical words of different meanings), such as sight, cite and site, are now grouped together, and such rhymes as stipulation and manipulation, rather than being buried in an alphabetical list of -ation words, appear side by side. With its ability to scan through a complete list of phonetic transcriptions in a matter of minutes, the computer is an incomparably more versatile rhymester than the live poet with his dying brain cells and deteriorating memory (p. v)."
This continues on in this vein, and the old ghosts of The Voice of the Poet: Robert Frost and of The Life and Works of William Butler Yeats (Naxos Audio) with all their debilitations, Mr. Yeats ending with the marvelous works of Cuchulain Comforted and Politics, arise to shake their leaves of paper my way in vigorous, brilliant protestations.
I tried to get a rhyming dictionary on the cheap, and this is not it. Fortunately I also ordered the Merriam-Webster, which is wonderful. I suggest you go there, not here, as you will be sorely disappointed and wonder as do I what now to do with it. It is obsolete and incomplete. If you can I urge you to go where I have never been, directly to the Oxford Rhyming Dictionary.