For example, עמק הבכא in Psalams 84:6 is often translated as "Valley of weeping", even though we should expect the word weeping to be בכי, and not at all with an Alef.
Do we have more instances of this substitution occurring?
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UPDATE: I went and found a few more examples:
Here is an example of Rashi saying a heh replaces an aleph, according to Mizrachi. The Gur Aryeh says the same thing. And here is another example with Rashi saying clearly that in many words, heh is replaced with aleph:
רפה שבריה כי מטה. לשון רפואה אע"פ שכתוב בה"א הרבה תיבות משמשות כן:
heal its breaches for it has faltered Heb. רפה, an expression of healing. Although it is spelled with a “hey,” many words are used in this manner.