auxiliary (n.)
- accessory
- accident
- accidental
- acolyte
- addendum
- addition
- adjunct
- adjutant
- adjuvant
- agent
- aid
- aide
- aide-de-camp
- aider
- aiding
- appendage
- appurtenance
- assistance
- assistant
- attendant
- backing
- coadjutor
- collateral
- complementary
- contingency
- contingent
- copula
- deputy
- extra
- fostering
- happenstance
- help
- helper
- helping
- helpmate
- helpmeet
- incidental
- inessential
- infinitive
- intransitive
- lieutenant
- ministrant
- more
- new
- nonessential
- other
- paraprofessional
- peripheral
- plus
- reserve
- second
- secondary
- servant
- serving
- spare
- subordinate
- subsidiary
- supernumerary
- supplement
- support
- supporter
- supporting
- surplus
- transitive
- tributary
- verb
auxiliary (adj.)
- accessory
- accidental
- additional
- adjunct
- adjuvant
- adscititious
- adventitious
- aid
- aiding
- ancillary
- another
- appurtenant
- assistant
- attendant
- casual
- circumstantial
- collateral
- complementary
- contingent
- contributory
- extra
- farther
- fortuitous
- fresh
- further
- helpful
- incidental
- inessential
- instrumental
- intransitive
- ministerial
- ministrant
- more
- new
- nonessential
- nurtural
- other
- peripheral
- plus
- second
- secondary
- servant
- serving
- spare
- subordinate
- subservient
- subsidiary
- superfluous
- supernumerary
- supplemental
- supplementary
- support
- supporting
- supportive
- surplus
- transitive
- tributary
- ulterior
- unessential
- verbal
