Is “Reinforcement” a Scrabble word?
Yes
REINFORCEMENT
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 Reinforcement
/ˌɹiːɪnˈfɔː(ɹ)smənt/
noun
1.The act, process, or state of reinforcing or being reinforced.
2.A thing that reinforces.
3.(in the plural) Additional troops or materiel sent to support a military action.