four vs quaternary

four and quaternary both are nouns.

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

As nouns, four and quaternary are synonyms defined as:

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

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

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

four (adjective)	quaternary (adjective)
being one more than three	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