There are 12 15-letter words that start with 'pla'.
| plainclothesman | plainclothesmen |
| plainspokenness | plaintivenesses |
| planimetrically | plasticizations |
| platinocyanides | platitudinarian |
| platitudinizing | platitudinously |
| platyhelminthic | plausiblenesses |
Note: These 12 15-letter words that start with 'pla' are found from the USA & Canada version of the tournament Scrabble word list.
Also see words start with plan, plas, plat, play, plac, plai, plag, plau, plaf, plaq, plaz.
4-letter words start with 'pla' (3)