There are 12 words that start with 'learn'.
| learn | learns | 
| learnt | learned | 
| learner | learners | 
| learning | learnable | 
| learnedly | learnings | 
| learnedness | learnednesses | 
Note: These 12 words that start with 'learn' are found from the USA & Canada version of the tournament Scrabble word list.