quaternion vs IV

quaternion and IV both are nouns.

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

As nouns, quaternion and IV are synonyms defined as:

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

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