The intelligent rhyme is sort of a 'fluid' rhyme that can find a number of end rhymes by adjusting the similarity in sound between the search word and the rhymes.
Words either rhyme, in which case they're perfect rhymes, or they don't, in which case they are near- or imperfect rhymes. Different writers have different preferences, but I only write perfect rhymes. It's fine if you don't, but it's not a feature I'd find useful for my work.
It also has a multi-syllabic button so you can find polysyllabic end rhymes. That's another feature that I really like that is missing in MasterWriter, McGill and online dictionaries.
The on-line dictionaries I mentioned, as well as rhymezone.com, all find polysyllabic rhymes. So does McGill.
Considering that Rhyme Genie can also search for perfect rhymes and has over 327,000 entries I doubt that any online rhyming dictionary will give you more results which is why I was eager to try out the words that you mentioned.
I had uninstalled Rhyme Genie, but I've reinstalled it just for you.
The Rhyme Genie demo mode only provides 9 offerings, but it does so in alphabetical order. That doesn't make for a fair test, but here goes:
One of my songs has this sequence (I write musical theater):
Character 1:
They're starting to doubt,
They'll figure it out,
Just what you're about. . .
Character 2:
Enough now, get out!
The word is, "out."
Rhyme Genie has 9 1-syllable offerings through "lout." RhymeZone has 16 1-syllable offerings through "lout." McGill has 15. WikiRhymer has 10. Miriam Webster only 7. Rhyme Genie beats Miriam Webster but loses to RhymeZone, McGill and WikiRhymer.
Of course, none of the rhymes provided by any of the programs solve my sequence above.
Of course McGill and online dictionaries also have none of the other song creation and administration features that MasterWriter or Rhyme Genie/TuneSmith offer which is my main motivation for considering either one. McGill is certainly a decent choice if you are looking for simple offline rhyming dictionary without any bells and whistles.
Well, that's where we differ. I have no need of song creation or administration features. I have no idea how valuable these features would be to most people. Because we write for theater, I've found a cheap "index card" program called ThroughLine which is very helpful for organizing scenes and determining structure, but it's strictly a tracking tool -- the equivalent of pinning up index cards, one for each scene, on a wall and then re-arranging them as necessary. I cannot, for the life of me, imagine what "song creation" tools would be, particularly in the context in which my partner and I write (and, of course, that doesn't mean anything for writers in other genres -- perhaps these tools are useful). We know the arc of the song, i.e. where the character or characters are at the beginning and and where they have to end up. We come up with a "hook" that suggests a motif, a theme and, in the best circumstances, the music. I write the music, we push out the lyrics (with the help of a rhyming dictionary) and that's the song. For musical theater, the function of a song is far more complicated than any other genre -- it has to advance the story and the action, it has to fit the character who sings it, it has to match the style of the other songs, etc. There's simply no "creativity tool" that's going to do that.
Rhyming dictionaries have been around long before there was an internet or rhyming software. I have a couple of hard bound dictionaries sitting around gathering dust on a shelf somewhere. I can't, and won't, speak for anyone else, but all my partner and I need are quick and comprehensive lists of perfect rhymes in a variety of syllable lengths, and the free tools I mentioned do that very well.
Now, what I'd REALLY like is a software rhyming dictionary that can do internal rhymes, e.g. you'd put in, "west side," and it would list, "best tried," "rest died," etc. Even better would be multiple internal rhymes. I've never seen anything that can do that in a single step -- we have to do separate searches on each word.
Anyway, good luck with your search and please report back as to which you get and how you like it.