There are 19 words that end with 'plex'.
| plex | diplex | duplex |
| complex | funplex | perplex |
| simplex | triplex | megaplex |
| fourplex | octuplex | quadplex |
| metroplex | multiplex | googolplex |
| noncomplex | overcomplex | heteroduplex |
| hypercomplex | ||
Note: These 19 words that end with 'plex' are found from the USA & Canada version of the tournament Scrabble word list.