Port Manteaux churns out silly new words when you feed it an idea or two.
Enter a word (or two) above and you'll get back a bunch of portmanteaux created by jamming together words that are conceptually related to your inputs.
For example, enter "giraffe" and you'll get back words like "gazellephant" and "gorilldebeest".
Enter "south america" and "chess" and you'll get back words like "checkuador". It uses the Datamuse API to find related words, and then finds combinations of these words that pair well together phonetically.
The academic study of slavery in ancient Greece is beset by significant methodological problems.