There are 13 14-letter words that start with 'am'.
| amateurishness | ambassadorship |
| ambassadresses | ambidextrously |
| amicablenesses | aminoacidurias |
| aminopeptidase | aminophyllines |
| amitriptylines | ammonification |
| amphibiousness | amphiprostyles |
| amplifications | |
Note: These 13 14-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)