There are 45 words that start with 'phyto'.
Note: These 45 words that start with 'phyto' are found from the USA & Canada version of the tournament Scrabble word list.
Also see words start with phytop, phytoc, phytol, phytog, phytot, phyton, phytos, phytoa, phytoh, phytof, phytoi.