Is “Swingby” a Scrabble word?
Yes
SWINGBY
Valid in at least one Scrabble dictionary
Valid in these dictionaries
SOWPODS / CSW
Scrabble UK & International
TWL / NWL
Scrabble North America
Large English Dictionary
General English word list
Meaning of Swingby
noun
1.An interplanetary flight in which the gravitational attraction of a planet is used to provide acceleration and a change in course.