Cognates are words in different languages that share an ancestor, such as English mother and German Mutter.

The longer version

English mother and German Mutter descend from the same ancestral word, and the difference in their consonants is not random: a regular sound shift turned one stop consonant into another in the Germanic branch. Once you know the correspondence, dozens of words line up on both sides.

Father and Vater, tooth and Zahn, three and drei all obey the same pattern, and linguists used such matched sets to work out how the languages are related. Cognates help learners, since recognising a familiar root speeds up vocabulary. The trap is over-applying the rule to words that merely look alike, which is where false friends appear.

Where this entry sits

This category gathers small surprises about the English language, from odd spelling rules to words that quietly hide their own history. Expect palindromes, punctuation oddities, borrowed terms, and the strange ways writing systems record spoken speech. The full list sits on the Words and Language page, where every entry is listed in order.