There are exceptions I know of for sure to their winner words. I would have told you duolingo except you wanted an email! But my winner words are the two words

There are exceptions I know of for sure to their winner words. I would have told you duolingo except you wanted an email! But my winner words are the two words all humans learn without being told: abba and umma which what babies actually say universally us ba or da and ma when referring to their father and mother. Adult languages take these words and add to them like with english it is pa or pappa or dad for father and mom or mommy or momma for mother. But I challenge anyone to find me babies that don't use those words or languages without an evolved form of those root words.