serial vs tetralogy

serial and tetralogy both are nouns.

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

As nouns, tetralogy is a hyponym of serial; that is, tetralogy is a word with a more specific, narrower meaning than serial:

Other hyponyms of serial include soap opera.

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

serial (adjective)	tetralogy (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