I thought I'd do something useful and propose that these two should be merged, but it turns out I can't, because I haven't scored sufficient rep on either of the tags - hardly surprising, since I've not even voted on any of the questions, but why should that be taken to imply I'm not qualified to know that blend-words and portmanteau-words mean exactly the same thing?
Apparently I did have enough rep against the [suffix] tag to not even notice this as a problem when I [proposed making [suffixes] a synonym]. But seeing that page just confuses me even more. That proposal has been there nearly a month now, and there are still only 3 votes - one short of the required 4 to action it. Presumably everyone would want to vote that synonym through, but they can't, because they don't have enough "relevant" rep.
This isn't strictly part of what I'm asking/ranting about above, but I also note that the synonym term <- terms was apparently proposed several months ago, and is sitting in some status called "merge". I don't know what "merge" means, but I must say both tags seem undesirable to me (or at least, they should both be synonyms of single-word-requests). Given there's only one question tagged term, and none at all for terms, I don't understand what's going on there at all.