There are 10 15-letter words that start with 'am'.
| ambassadorships | ambidexterities |
| ambiguousnesses | ambisexualities |
| ambitiousnesses | aminopeptidases |
| ammonifications | amorphousnesses |
| amphidiploidies | amphitheatrical |
Note: These 10 15-letter words that start with 'am' are found from the USA & Canada version of the tournament Scrabble word list.
Also see words start with amb, amp, ami, ama, ame, amo, amm, amy, amn, amu, amr, amt, ams.
3-letter words start with 'am' (4)