1) Accessory 2) Adjunct 3) Adjuvant 4) Ancillary 5) Appurtenant 6) Auxiliary 7) Certificatory 8) Collateral 9) Confirmative 10) Confirmatory 11) Confirming 12) Corroborative 13) Corroboratory 14) Demonstrative of 15) Encouraging 16) Giving support 17) Positive 18) Subsidiary 19) Substantiating 20) Substantiative 
[adj] - furnishing support or assistance
adjective furnishing support or assistance; `a supportive family network`; `his family was supportive of his attempts to be a writer`
giving support. · providing sympathy or encouragement: His family was supportive of his attempts to be a writer. · providing additional help, information, etc.; auxiliary: manufacturers of supportive materials. · helping to maintain a normal physiological balance, as by the intravenous administration of required nutriment.
furnishing assistance furnishing assistance