sestet vs sixer

sestet and sixer both are nouns.

Word	Noun	Adjective	Verb	Adverb
sestet	Yes	No	No	No
sixer	Yes	No	No	No

As nouns, sestet and sixer are synonyms defined as:

Other synonyms of sestet include 6, Captain Hicks, half a dozen, hexad, sextet, sextuplet, sise, six, VI.

sestet (noun)	sixer (noun)
a musical composition written for six performers	the cardinal number that is the sum of five and one
a rhythmic group of six lines of verse
a set of six similar things considered as a unit
six performers or singers who perform together
the cardinal number that is the sum of five and one