[happytoexplain]

Hmm, that seems to stray from the general definition of "multinym" as used in the OP.

If we did stick with the idea of pronunciation, some of the examples from your list could be included if we allow regional accents, e.g. steel-still, peel-pill. However, those accents would also include many other sets not in the OP. barren-bearing particularly stands out, because I can't think of any accent that pushes those together audibly.

[zdunn]

In the United States South, its very common to drop the 'g' at the end of a word ending in '-ing'. barren-bearing can definitely sound the same here.