noun
ADJECTIVE
▪ big , key , main , major , real
▪ potential
VERB + STUMBLING BLOCK
▪ be , prove , prove to be
▪
Money could prove a ~ to the project.
▪ become
▪ hit
▪
The negotiations have hit a ~ over the price.
▪ remove
PREPOSITION
▪ ~ to
▪
The question of disarmament proved a major ~ to agreement.