Discovered a weird bit of pronunciation distinction in friends today, between three words:
- lair (as in home to monster)
- layer (as in levels of a cake)
- layer (as in "one who lays things down", like a mine layer)
Unlike most of the differentiations in dialects I'm aware of (e.g. cot-caught, pin-pen), I can't find any clear information on this one (is it a merger of historically separate words, or a split of historically equivalent words?), or the geographic distribution.
For me (Maryland native from D.C. region), "lair" is a single syllable with a vowel that, while not exactly the same as the true short 'a' sound in "mat", is pretty close (just slurred a bit by the growling sound of the adjacent 'r'; it's the same way I say "air", just with a tongue flick preceding it, and rhymes with words like "there", "where", "hair", "fair", "fare", etc.), and either sense of "layer" is two syllables, where the 'a' is 100% long (as in "way"), with the second syllable being an almost standalone growling 'r' sound (sense 2 might be a little more blurred, where sense 3 is more clearly split, but they're both closer to two syllables than one when I'm not rushing), roughly rhyming (when I enunciate clearly, which I frequently don't) with "they're".
For at least one person (from Seattle), they're all homophones, all two syllables, all with a long-a sound (again, slurred a bit by the 'r'). A Vancouver, WA native (who you'd expect to have similar pronunciation to the Seattleite) agrees with me. Yet another person (from north Florida) says sense 1 and 2 are homophones with a single syllable pronounced with an almost short-a sound, while sense 3 (despite being spelled the same as sense 2) is two syllables with a clear long-a sound.
Similar patterns seem to arise with pairs like "payer" and "pair", "mayor" and "mare", etc.
My best guess is that this is related to the Mary-marry-merry merger (we're all fully merged), but that somehow, we merged towards different locations in the space, some moving towards longer 'a' sounds (and therefore making homophones with other long-a words, with syllables dropping due to similarity?), others towards shorter 'a' sounds (and therefore distinguishing from long-a words, and possibly preserving the syllable difference to enunciate the distinction).
Is there a proper description of this merge/split pattern? Is it related to Mary-marry-merry mergers, or independent of it? I assume it's another historic feature related to 'r' sounds, but I've been unable to pin it down.