quadruplet vs quaternary

quadruplet and quaternary both are nouns.

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

As nouns, quadruplet and quaternary are synonyms defined as:

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

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

quadruplet (noun)	quaternary (noun)
a set of four similar things considered as a unit	the cardinal number that is the sum of three and one
one of four children born at the same time from the same pregnancy
the cardinal number that is the sum of three and one

quadruplet (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