Slant rhyme, dear Delfine, or sometimes called near rhyme, are words that come close to rhyming...but! they don't really rhyme...
the words have similar but not identical sounds as opposed to an exact rhyme: mine-rhyme .
thames - James / slant rhyme
around - out
What is your intention?
To get the reader to pay closer attention to the words themselves rather than the sounds of them ( the words ) ??