step rocket

NOUN /stɛp_'rɑkɪt/
11 LETTERS · STARTS WITH S

step rocket is a valid 11-letter word worth 18 points in Scrabble and 20 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS
S1T1E1P3R1O1C3K5E1T1
1 + 1 + 1 + 3 + 0 + 1 + 1 + 3 + 5 + 1 + 1 =18 PTS
DOUBLE WORD → 36TRIPLE WORD → 54
MEANING

What does step rocket mean?

NOUN · 1 SENSE
1

A rocket having two or more rocket engines (each with its own fuel) that are fired in succession and jettisoned when the fuel is exhausted.