semiology vs semiotics

semiology and semiotics both are nouns.

Word	Noun	Adjective	Verb	Adverb
semiology	Yes	No	No	No
semiotics	Yes	No	No	No

As nouns, semiology and semiotics are synonyms defined as:

semiology and semiotics: (philosophy) a philosophical theory of the functions of signs and symbols

semiology (noun)	semiotics (noun)
(philosophy) a philosophical theory of the functions of signs and symbols	(philosophy) a philosophical theory of the functions of signs and symbols