Is “Breakthrough” a Scrabble word?
Yes
BREAKTHROUGH
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 Breakthrough
/ˈbɹeɪkθɹuː/
noun
1.An advance through and past enemy lines.
2.Any major progress; such as a great innovation or discovery that overcomes a significant obstacle.
“Albert Einstein is credited with making some of the greatest breakthroughs in modern physics.”
3.The penetration of the opposition defence
adjective
1.Characterized by major progress or overcoming some obstacle.
“a breakthrough technological advance”