quaternion vs quaternary

quaternion and quaternary both are nouns.

Word	Noun	Adjective	Verb	Adverb
quaternion	Yes	No	No	No
quaternary	Yes	Yes	No	No

As nouns, quaternion and quaternary are synonyms defined as:

quaternion and quaternary: the cardinal number that is the sum of three and one

Other synonyms of quaternion include 4, four, foursome, IV, Little Joe, quadruplet, quartet, quatern, quaternity, tetrad.

quaternion (noun)	quaternary (noun)
the cardinal number that is the sum of three and one	the cardinal number that is the sum of three and one

quaternion (adjective)	quaternary (adjective)
	consisting of or especially arranged in sets of four
	coming next after the third and just before the fifth in position or time or degree or magnitude