For teachers

Why it works in class

Each puzzle is a small piece of evidence: a line showing when a word was in use. To solve it, students have to read a chart, form a hypothesis about an era and test it, and every guess gives them feedback. Afterwards the story of the word connects the curve to real events, with sources students can follow.

A five-minute starter

1. Project today’s puzzle. Before anyone guesses, ask: When was this word most used? What was happening then?
2. Take guesses from the room and type them in. Talk through each arrow: did the answer peak earlier or later?
3. Use the hints only when the class is stuck. The category often starts a good discussion on its own.
4. When it’s solved, read the story aloud and look at the marked moments on the curve.

Ideas for history lessons

• Era detectives. Pick past puzzles from the archive that match your unit and replay them. Students explain which events moved the curve.
• Before and after. Ask students to predict the curve of a word linked to your topic, then guess it in practice mode or compare it with a related word on a story page.
• Source check. Every story links its sources. Students pick one fact and confirm it in the source, then decide whether the curve supports the story.

Ideas for English and vocabulary

• Words that faded. Compare a word that has died out with the word that replaced it: “railway” and “railroad”, or “wireless” and its later meaning.
• Same word, new meaning. Some curves rise twice because the word found a second use. Ask students to spot the second rise and research why.
• Spelling and form. Hyphenated and accented spellings are counted separately in the data. That’s a good way into how spelling changes over time.

Data literacy

The curves show printed books, not speech, and the mix of books changes over time. Our methodology page explains the limits in plain language. Ask students: What could make a word look more popular in this data than it really was?

Practical notes

• Nothing to install and no sign-ups. It runs in any modern browser.
• For projectors, the dark theme (switch in the footer) often reads better.
• Results are saved only in the browser on the device you use, so a shared classroom computer keeps one set of stats.

Using Words Ago with a class? We’d like to hear what worked: hello@wordsago.com.