Linguists use "convowel" patterns to discover, define, and elaborate paradigms in the stem changes and markings for tense, aspect, number, case, and other grammatical cues in languages or comparative historical changes in the languages and language groups they study.
On this website, the scant few who tag words by their convowel patterns do so for various reasons. For instance, some of the patterns are palindromic, e.g., vcvvcv. Using such tags allows one to group disparate words that wouldn't otherwise be associated, in this instance.
'discover a pattern' I like that aspect .. find out which words overlap patterns and try to develop an algorithm out of it .. the purpose still escapes me at the moment but may be useful to auto create words from the root spelling patterns. worth a thought.. for the future. noted.
I suppose the point has to do with wanting to make order out of chaos, or discover a pattern that nobody has seen before, or collect an example of each variation (regardless of whether the variations are infinite). I think it's the same impulse that draws us toward classifying life into kingdoms, and words into lists, and posts on this site into SPAM or not-Spam.
No, no. I was only kidding when I was pretending not to know what such tags represent. The c's are consonants, and the v's are vowels. The patterns are lovely and awe-inspiring. See the tags for convowel.