haltere vs balancer

haltere and balancer both are nouns.

Word	Noun	Adjective	Verb	Adverb
haltere	Yes	No	No	No
balancer	Yes	No	No	No

As nouns, haltere and balancer are synonyms defined as:

haltere and balancer: either of the rudimentary hind wings of dipterous insects; used for maintaining equilibrium during flight

Other synonyms of haltere include halter.

haltere (noun)	balancer (noun)
either of the rudimentary hind wings of dipterous insects; used for maintaining equilibrium during flight	either of the rudimentary hind wings of dipterous insects; used for maintaining equilibrium during flight
	an acrobat who balances himself in difficult positions