mainstay
I
noun
anchor, assurance, backbone, backer, bastion, brace, bulwark, buttress, champion, chief reliance, cornerstone, crutch, deliverance, dependence, foundation, help, keystone, maintainer, nucleus, pillar, principal backer, principal maintainer, principal support, principal supporter, principal sustainer, prop, rampart, reinforcement, reliance, right arm, right hand, salvation, security, staff, stay, strength, stronghold, support, sustainer, sustenance, tower of strength, upholder
II
index
abettor, backer, cornerstone, partisan, strength, support (assistance)
Burton's Legal Thesaurus.
William C. Burton.
2006