Portmanteau words! They are words you make out of words! Lewis Carroll invented the term (from the French portmanteau, a large suitcase with two hinged compartments) and created the most famous examples (slithy, lithe + slimy, and chortle, chuckle + snort) in The Jabberwocky.
The great thing is, you can make up a portmanteau word and no one can tell you it is wrong. It’s your portmanteau! For instance, I will make some up right now:
- atavuncular (from atavistic, reverting to or suggesting the characteristics of a remote ancestor or primitive type + avuncular, suggestive of an uncle esp. in kindliness or geniality): having the qualities of a kindly older gentleman who occasionally conducts ancient forbidden blood rituals and smashes things with his bone-club
- jaundy (from jaundice, disease caused by buildup of bile + jaunty, easy and sprightly in manner or bearing): when you have a liver ailment, but are still maintaining an upbeat attitude toward life!
- Chimerica: (from chimera, imaginary monster compounded of incongruous parts + America, a country): A nation populated exclusively with minotaurs, manticores, centaurs, and the like
- South Chimerica: Like Chimerica, only the manticores etc. speak Spanish and subsist on delicious empanadas
- hobot (from hobo, a vagrant + robot, a cyborg): self-explanatory
- doömlaut (from doom, ruin, death, adverse fate + umlaut, the Germanic diacritic mark): Unnecessary punctuation in the name of a death metal band
OK, now I’m just doing Sniglets. Sorry, I’ll stop now.