There are 16 words that start with 'flus'.
| flus | flush | flushed | 
| flusher | flushes | fluster | 
| flushers | flushest | flushing | 
| flusters | flushable | flushness | 
| flustered | flustering | flushnesses | 
| flusteredly | ||
Note: These 16 words that start with 'flus' are found from the USA & Canada version of the tournament Scrabble word list.