There are 13 words that start with 'lexica'.
| lexica | lexical | 
| lexically | lexicality | 
| lexicalize | lexicalized | 
| lexicalizes | lexicalities | 
| lexicalizing | lexicalisation | 
| lexicalization | lexicalisations | 
| lexicalizations | |
Note: These 13 words that start with 'lexica' are found from the USA & Canada version of the tournament Scrabble word list.