May one place a Talmudic dictionary like the Otzar Rashei Teivos on top of other holy sefarim? I had always assumed that it has the status of a sefer, but others have expressed doubts on this issue.
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On the type of dictionary that you are asking about, where it is more collecting words without interpretation, it may be different, however I looked up the specific one you referenced, and the online image I found shows a Roshei Tevos which is a complete verse from Tehilim, so entire verses of Torah are printed there, intended to enable learning. So it would be strange to call it an exception - certainly לחומרא.