subserve
/ˈsʌbˌsɛrv/Definitions
1. verb
to serve or minister to the needs or interests of (someone or something); to be of use or service to
“The new policy will subservive the needs of low-income families.”
2. noun
something that serves or ministers to the needs or interests of (someone or something); an instrument or means of serving or ministering to
“The school’s counseling service subserved as a vital support system for students.”