1. Bird
2. Boy
3. Girl
4. Dog
5. Recorder (Instrument)

“The naming process, the act of naming the items of the world, is as old as the first words spoken by our ancestors.” is the least said with the most words I’ve seen in a fair while!

The first 4 I can understand. Single syllable words, hard to trace or make guesses about.

Recorder has always puzzled me. It’s such a specific word, and never made any sense to me. I hope the article author succeeds in finding an answer.