equivalent (n.)
- affirmative
- agent
- agnate
- akin
- alike
- ally
- alternate
- alternative
- analogue
- analogy
- associate
- backup
- balance
- ballast
- brother
- change
- changeling
- close
- cognate
- companion
- comparison
- compeer
- complement
- complementary
- congenator
- congener
- consideration
- consonant
- convertible
- cooperative
- coordinate
- copy
- correlate
- correlative
- correspondent
- counterbalance
- counterfeit
- counterpart
- counterpoise
- counterweight
- deputy
- ditto
- double
- dummy
- duplicate
- equal
- equipoise
- ersatz
- even
- exchange
- facsimile
- fake
- fellow
- fill-in
- ghost
- ghostwriter
- give-and-take
- homograph
- homonym
- homophone
- image
- imitation
- like
- likeness
- makeshift
- makeweight
- match
- matching
- mate
- metaphor
- metonymy
- mock
- obverse
- offset
- parallel
- peer
- pendant
- personnel
- phony
- picture
- pinch
- positive
- proxy
- reciprocal
- relief
- replacement
- replica
- representative
- reserve
- reserves
- ringer
- rival
- secondary
- setoff
- sign
- similitude
- simulacrum
- sister
- spare
- stand-in
- standard
- stopgap
- sub
- substitute
- substitution
- succedaneum
- such
- supplanter
- surrogate
- symbol
- synecdoche
- synonym
- tally
- temporary
- token
- twin
- understudy
- uniform
- utility
- vicar
- vice-regent
equivalent (adj.)
- accordant
- affirmative
- agnate
- agreeable
- akin
- alike
- ally
- alternate
- alternative
- analogous
- analogue
- answerable
- answering
- associate
- change
- changeable
- close
- coequal
- coexistent
- coexisting
- coextensive
- cognate
- coherent
- coincident
- coincidental
- coinciding
- commensurate
- commutable
- commutative
- comparable
- compatible
- complemental
- complementary
- concordant
- concurring
- conformable
- congenial
- congruent
- congruous
- consentaneous
- consentient
- consistent
- consonant
- convertible
- cooperative
- coordinate
- correlate
- correlative
- correspondent
- corresponding
- coterminous
- counterfeit
- double
- dummy
- duplicate
- equal
- ersatz
- even
- exchanged
- fake
- fellow
- harmonious
- homologous
- identical
- imitation
- indistinguishable
- interchangeable
- like
- like-minded
- makeshift
- matching
- mate
- mock
- mutual
- parallel
- pendant
- permutable
- personnel
- phony
- positive
- proportionate
- provisional
- reciprocal
- reciprocating
- reciprocative
- reconcilable
- representative
- retaliatory
- returnable
- secondary
- self-consistent
- selfsame
- sign
- similar
- spare
- standard
- substitute
- such
- suchlike
- surrogate
- symbiotic
- synchronized
- synchronous
- synonymous
- tantamount
- temporary
- tentative
- token
- transposed
- twin
- unanimous
- uniform
- utility
- vicarious
