sequel vs subsequence

sequel and subsequence both are nouns.

Word	Noun	Adjective	Verb	Adverb
sequel	Yes	No	No	No
subsequence	Yes	No	No	No

As nouns, sequel and subsequence are synonyms defined as:

sequel (noun)	subsequence (noun)
a part added to a book or play that continues and extends it	following in time
something that follows something else	something that follows something else