quadruplet vs IV

quadruplet and IV both are nouns.

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

As nouns, quadruplet and IV are synonyms defined as:

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

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