secondary (n.)
- accessory
- accident
- accidental
- addendum
- addition
- adjunct
- advocate
- agent
- alternate
- alternative
- analogy
- appendage
- appurtenance
- assistant
- attorney
- auxiliary
- backup
- binary
- binate
- champion
- change
- changeling
- cog
- collateral
- coming
- common
- commonality
- commonalty
- comparison
- contingency
- contingent
- copy
- counterfeit
- covert
- creature
- dependent
- deputy
- derivative
- dinky
- double
- dual
- dummy
- duplex
- duplicate
- employee
- equal
- equivalent
- ersatz
- exchange
- exponent
- extra
- fake
- feather
- figurehead
- fill-in
- final
- flunky
- follower
- geminate
- ghost
- ghostwriter
- hackle
- halftone
- happenstance
- helper
- imitation
- incidental
- inessential
- inferior
- junior
- last
- less
- lieutenant
- lightweight
- locum
- low
- lower
- makeshift
- masses
- metaphor
- metonymy
- minor
- mock
- monochrome
- nonessential
- ordinary
- other
- pawn
- personnel
- phony
- pinch
- pleader
- plumage
- primary
- procurator
- proxy
- relief
- replacement
- representative
- reserve
- reserves
- resultant
- ringer
- scrub
- second
- servant
- sign
- small
- spare
- spectrum
- speculum
- stand-in
- stopgap
- sub
- subaltern
- subject
- subordinate
- subsidiary
- substitute
- substitution
- succedaneum
- supplanter
- supplement
- supporting
- surrogate
- symbol
- synecdoche
- temporary
- tertiary
- token
- tributary
- twin
- ultimate
- under
- underling
- understudy
- utility
- vicar
- vice
- vice-regent
- vicegerent
- yes-man
secondary (adj.)
- accessory
- accidental
- additional
- adjunct
- adscititious
- adventitious
- alternate
- alternative
- ambidextrous
- ancillary
- appurtenant
- assistant
- auxiliary
- bifacial
- biform
- bilateral
- binary
- binate
- biparous
- bivalent
- casual
- champion
- change
- circumstantial
- collateral
- coming
- common
- consequent
- contingent
- counterfeit
- covert
- demeaning
- dependent
- derivational
- derivative
- derived
- dinky
- disadvantaged
- double
- double-faced
- dual
- dummy
- duple
- duplex
- duplicate
- equal
- equivalent
- ersatz
- eventual
- extra
- fake
- final
- fortuitous
- hackle
- humble
- imitation
- incidental
- indirect
- inessential
- inferior
- insignificant
- junior
- last
- less
- lesser
- lightweight
- low
- lowly
- makeshift
- marginal
- minor
- mock
- modest
- monochrome
- nonessential
- ordinary
- other
- personnel
- phony
- primary
- provisional
- representative
- resultant
- scrub
- second
- secondhand
- servant
- servile
- sign
- small
- small-time
- spare
- subaltern
- subject
- subordinate
- subsequent
- subservient
- subsidiary
- substitute
- superfluous
- supplemental
- supplementary
- supporting
- supportive
- surrogate
- temporary
- tentative
- tertiary
- token
- tributary
- twin
- twinned
- two-faced
- two-ply
- two-sided
- twofold
- ultimate
- under
- underprivileged
- unessential
- unimportant
- unoriginal
- utility
- vicarious
- vice
- vulgar
