well, there are over 24,000 hits at Yahoo on "commoner than" (quotation marks are important for grouping the terms together) many from medicine thus it must be in recent use Now "more common than" gives over 1 million hits, thus you see which is in more frequent usage. Also, a recent dictionary says: Inflected Form(s): often -e r/-est thus commoner is often used as the comparative degree of the adjective. Also, you should try a search on commoner at this site, to find more current usage examples in other threads.
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Marius Hancuwell, there are over 24,000 hits at Yahoo on
"commoner than"
(quotation marks are important for grouping the terms together)
many from medicine
thus it must be in recent use
Now
"more common than" gives over 1 million hits, thus you see which is in more frequent usage.