IV vs quaternary

IV and quaternary both are nouns.

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

As nouns, IV and quaternary are synonyms defined as:

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

IV (noun)	quaternary (noun)
administration of nutrients through a vein	the cardinal number that is the sum of three and one
the cardinal number that is the sum of three and one

IV (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