Is “Fallback” a Scrabble word?
Yes
FALLBACK
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 Fallback
/ˈfɔːl.bæk/
noun
1.An act of falling back.
2.A backup plan or contingency strategy; an alternative which can be used if something goes wrong with the main plan; a recourse.
“As a fallback, I suppose we can use typewriters if the word processing system fails.”
3.A reduction in bitumen softening point, sometimes called refluxing or overheating in a relatively closed container.
Synonyms: ebbing, recession, retreat, back-up, backup, plan B
adjective
1.That can be resorted to as a fallback.
“a fallback plan”
Synonyms: alternate, alternative, back-up, backup, secondary