quaternary vs four

quaternary and four both are nouns.

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

As nouns, quaternary and four are synonyms defined as:

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

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

quaternary (noun)	four (noun)
the cardinal number that is the sum of three and one	a playing card or domino or die whose upward face shows four pips
	the cardinal number that is the sum of three and one

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