For example, English has 26 consonants, 12 vowels and three diphthongs, even though there are only 26 letters in the English alphabet.
See:
... Anthophobia[?] Anthrax Anti-factor VIII autoimmunization[?] Antigen-peptide-transporter 2 deficiency[?] Anti-HLA hyperimmunization[?] Antihypertensive ...