Learning a second language often feels like starting from scratch, but English-speaking students have a head start when learning Spanish. By studying "cognates," which are words that look similar and share meanings across languages, students can instantly unlock thousands of words. New reports and educational research show how teaching these connections improves reading comprehension and vocabulary for school-aged learners.
What Happened
A recent analysis by Duolingo shows the structural overlap between English and Spanish, pointing to research that shows the two languages share between 10,000 to 15,000 cognates. Because of this overlap, English speakers already recognize a large portion of Spanish vocabulary before their first lesson. According to Colorin Colorado, more than 30% to 40% of all words in the English language have a related word in Spanish.
These words fall into predictable patterns. Perfect cognates, such as "animal" and "chocolate," are spelled identically in both languages. Near-perfect cognates have slight spelling variations, like "family" becoming familia or "telephone" becoming teléfono. Other patterns are highly predictable. For example, English words ending in "-tion" almost always translate to "-ción" in Spanish, such as "information" becoming información.
The Bigger Picture
For educators and parents, using cognates supports literacy. According to the Iowa Reading Research Center, multilingual learners make up 10.6% of the U.S. student population. These students often face persistent vocabulary and academic language gaps that can remain even after six years of English-language schooling.
Research shows that explicit morphology instruction, which teaches students to break down and analyze word parts like roots, prefixes, and suffixes, improves reading comprehension and vocabulary. Instead of teaching words in isolation, educators use the Morphemic Analysis Strategy to help students identify these patterns. This approach helps students use their native language as an academic asset.
Language learning also contains traps. "False cognates," which are words that look identical but have entirely different meanings, often mislead students. For example, the Spanish word embarazada means pregnant, not embarrassed, and éxito means success, not exit.
According to the Spanish Authority, false cognates trigger a cognitive pattern-matching error known as "cross-linguistic interference." This issue is most common among intermediate-level students who have enough fluency to read quickly but lack the vocabulary depth to catch their own errors. As a result, students often read with false confidence, which disrupts comprehension.
What This Means for Families
When children use tools like Duolingo's language platform at home, parents can help them progress by pointing out these connections. Instead of forcing children to memorize lists through rote repetition, families can focus on structural patterns.
For example, knowing that an English "-ty" ending corresponds to a Spanish "-dad" (like "liberty" and libertad) helps students deduce meanings on their own. Parents should also point out common false cognates early to prevent incorrect reading habits from forming.
What You Can Do
To help your child, you can practice morphemic analysis at home by breaking down unfamiliar words into prefixes, roots, and suffixes. This helps find common denominators between English and Spanish. You can also keep a running list of "false friends"—tricky false cognates like ropa (clothing, not rope) and asistir (to attend, not to assist)—to review before reading. Finally, try mapping spelling patterns together. Look for common letter transformations, such as how English words starting with "s" and a consonant often start with "es" in Spanish, like "special" and especial.