instrumental (adj.)
- accessory
- adjuvant
- advantageous
- agential
- ancillary
- assistant
- auxiliary
- beneficial
- catalytic
- conducive
- contributory
- employable
- handy
- helpful
- important
- jazzy
- mediatorial
- ministerial
- ministrant
- nurtural
- orchestral
- serviceable
- serving
- significant
- subservient
- subsidiary
- supporting
- supportive
- symphonic
- syncopated
- useful
- utilitarian
- valuable
