> The term characterized farmers having a red neck caused by sunburn from hours working in the fields. A citation from 1893 provides a definition as "poorer inhabitants of the rural districts...men who work in the field, as a matter of course, generally have their skin stained red and burnt by the sun, and especially is this true of the back of their necks"
Parola per Parola is probably worth a look. Check out the 'Il mondo del lavoro' section in the Amazon preview and see if it looks along the lines of what you're looking for.
It's a good bit more expensive than Parola per Parola, but the Oxford-Paravia Italian Dictionary seems like it would have a lot of good stuff for your needs starting around page 2729 of the Amazon preview.
You can try the book Basic Tagalog for Foreigners and Non-Tagalogs by Paraluman S. Aspillera -- my dad used an older edition to help learn Tagalog when he moved here in the 1980s and he's become quite fluent, and the new ebook edition on Amazon looks like it's even better since it's been modernized as of 2007 and also now has audio files. Since you said you picked up a fair bit already (which is awesome!) the first several lessons might be pretty basic for you, but the later lessons will definitely provide some good information & practice.
If you're also in need of things to watch for practice, you can try TFC.tv. With a free account you can watch the 3 most recent episodes of shows -- good for watching news programs like TV Patrol -- or with a paid account you can watch all episodes of shows plus a large selection of movies.
I used Spanish Tutor, which I found in a Barnes and Noble. It was SO helpful. Here's the book on Amazon so you can see which one. This was advanced beginner to upper intermediate. I'm not sure which level you need or which other levels they have, but I highly recommend these authors. Very concise & very useful grammar lessons. I believe there is also one by them called Complete Latin American Spanish.
I'm better acquainted with Proto-Japanese grammar/morphology than Proto-Japonic (mostly because I haven't delved into Ryukyuan studies very deeply), but I suppose I know more than your average joe about it...
Most of what I've learned, I've picked up from Alexander Vovin's Western Old Japanese comparative grammar (revised version forthcoming) and Bjarke Frellesvig's history of Japanese. Vovin and Frellesvig have substantially different ideas on some key points of the proto-reconstructions—like the derivations of some morphemes and the interpretations of some tricky Old Japanese passages—and the two of them together can provide a good breadth of understanding.
I've also got a whole lot of my own thoughts on reconstructions, but the world isn't ready for them yet...
There's a Kindle version for $12.69, I don't think someone would digitize it for you for less than that.
The way you’re describing rhymes reminds me of this songwriting course I did on Coursera, taught by Pat Pattinson. I highly recommend it for anyone interested in songwriting (it’s free to audit), and his book songwriting without boundaries is great.
He recommends this rhyming dictionary: The Complete Rhyming Dictionary: Including The Poet's Craft Book https://www.amazon.com/dp/0440212057/ref=cm_sw_r_cp_api_i_xxJLFbB02NKGC
And also this thesaurus for the way it lays out synonyms: Roget's International Thesaurus, 8th Edition [thumb indexed] https://www.amazon.com/dp/0062843729/ref=cm_sw_r_cp_api_i_4CJLFbVX06QPP?_encoding=UTF8&psc=1
I don’t know that any rhyming dictionary actually lays out slant rhymes, but hopefully this one helps. I haven’t actually gotten it yet because I haven’t quite exhausted my dads old beaten up Webster’s rhyming dictionary, but the course taught me to just make a list of all the slant rhymes and go to those in the dictionary separately. It’s a bit tedious but usually doesn’t take too long once you get to know your dictionary.
Hope that helps!