There are 12 words that start with 'synap'.
| synapse | synapsed | synapses |
| synapsid | synapsis | synaptic |
| synapsids | synapsing | synaptosome |
| synaptically | synaptosomal | synaptosomes |
Note: These 12 words that start with 'synap' are found from the USA & Canada version of the tournament Scrabble word list.