balancer vs haltere

balancer and haltere both are nouns.

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

As nouns, balancer and haltere are synonyms defined as:

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

Other synonyms of balancer include halter.

balancer (noun)	haltere (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