The term apico-alveolar refers to a specific type of consonant sound that is produced by the apex of the tongue touching the alveolar ridge just behind the upper teeth. Some common synonyms for the apico-alveolar sound include dental-alveolar, post-dental, and laminodental. These terms describe the same type of consonant sound, but emphasize different aspects of its production. Another synonym is the "coronal palatal" which refers to the consonant sound produced by the tongue blade touching the hard palate. The use of these terms can help linguists and phoneticians describe and analyze the sounds of different languages.