Casa, cosa, caso – and coso, the Spanish word for thingamajig or whatshisname

Two words I learned right when I started with Spanish were casa (house) and cosa (thing). Later, I learned caso (case or fact). Sometimes, when they come up in my vocabulary exercises, I mix them up and think cosa for caso, say. Just now, caso came up, so I ran through all three to make sure I was keeping them straight. And then I wondered whether coso is a word in Spanish, so I looked it up on wordreference.com – and I burst out laughing, because the first translation for coso is thingamajig, doohickey, and whatshisname (as well as arena or bullring, and main street). That's a very useful word to know! (Andrew Shields, #111words, 1 July 2022)