The Same Word takes one etymon and runs it down six dated eras across twenty-nine lineages. That is the right picture for a word that survived everywhere, and most words did not, so most of that grid is blank. This asks the other question: pick a meaning, and see what each language actually says for it.

• The answer is never one word. 155 of these languages have a word for night and they are saying at least seven different Proto-Indo-European roots. English night, Bulgarian нощ and Greek νύχτα are one root; Bengali রাত and Assamese ৰাতি are a second; Armenian գիշեր is a third.
• There are no empty cells, by construction. The words run in one continuous line, six to a row, and a heading marks the point where the root they descend from changes. Every language appears exactly once, under the root its own word belongs to. A language that replaced the word is not a gap; it is further down the sheet under a different root, and where it went is the interesting part.
• Type any of 170 meanings in the control bar. The list is the Swadesh-style concept set IE-CoR was built on: body parts, numbers, kinship, weather, the verbs everybody has.
• Colour is the branch, and forms appear in their own script wherever the language has one, with the romanisation underneath.
• This is not a European family. IE-CoR's largest group is Indo-Iranian: 53 of its 160 languages, against 23 Italic and 22 Germanic. Ask it for night and two of the three big roots are almost entirely Indo-Iranian. The family only looks European if you keep choosing European words.
• Cognacy here is judged by scholars, not inferred by an algorithm, and the roots printed at the head of each band are the ones the IE-CoR editors assigned. A leading question mark is theirs, and means they were not sure.

Data: IE-CoR, the Indo-European Cognate Relationships database, CLDF release efd7442, 160 languages and 170 meanings. The "one language each" heading near the foot of some sheets collects roots with a single witness in this dataset; they are real, and pooling them keeps forty headings off a sheet that only needs six.

Elsewhere: The Same Word · The Missing N · Flat-Foot · Polite Company · Empty Orchestra · Heartwood · Every Language Family