1. Serving to support or corroborate
   - collateral, confirmative, confirming, confirmatory, corroborative, corroboratory, substantiating, substantiative, validating, validatory, verifying

See also: supportive, verify

• subsurface
• subsystem
• subtenant
• subtend
• subterfuge
• subterminal
• subterranean
• subterraneous
• subtext
• subthalamic nucleus
• subthalamus
• subtile
• subtilin
• subtilise
• subtilize
• subtitle
• subtle
• subtleness
• subtlety
• subtly
• subtonic
• subtopia
• subtotal
• subtract
• subtracter