Answer:
The word, mellifluous, is an eleven letter word. A player is only limited to a seven letter tiles in a turn and the words, 'ell' or 'flu' has to be present on the board + another letter tile. The probability of occurrence of this word to be laid on the scrabble board in a turn is .0001% if nil.
However, for the sake of scoring:
where: m=3, e=1, l=1, l=1, i=1, f=4, l=1, u=1, o=1, u=1, s=1
If laid on a non-premium square, the total score would be 16 points.