There are 13 14-letter words that start with 'pla'.
| planetological | planetologists |
| planlessnesses | plasmaphereses |
| plasmapheresis | plasticization |
| plastoquinones | platinocyanide |
| platitudinized | platitudinizes |
| platyhelminths | plausibilities |
| playwrightings | |
Note: These 13 14-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)