mainstay Synonyms

keystone pillar backbone bulwark support supporter linchpin anchor foundation cornerstone lynchpin linch pin circular center central sources central keystone chief support central component tower of strength right-hand woman support system lifeline hired hand everyday player go-to player key component basic necessity essential element core element living room staple like center key player inner most part heart of the work heart of the system hired help aide colleague collaborator centrepiece center buttress bastion basis base backer atlas apprentice aider accomplice confederate