tetralogy vs serial

tetralogy and serial both are nouns.

Word	Noun	Adjective	Verb	Adverb
tetralogy	Yes	No	No	No
serial	Yes	Yes	No	No

As nouns, serial is a hypernym of tetralogy; that is, serial is a word with a broader meaning than tetralogy:

Other hypernyms of tetralogy include series.

tetralogy (noun)	serial (noun)
a series of four related works (plays or operas or novels)	a serialized set of programs
	a periodical that appears at scheduled times

tetralogy (adjective)	serial (adjective)
	pertaining to or occurring in or producing a series
	pertaining to or composed in serial technique
	of or relating to the sequential performance of multiple operations
	in regular succession without gaps