super vs extremely

super is a noun but extremely is not a noun.

Word	Noun	Adjective	Verb	Adverb
super	Yes	Yes	No	Yes
extremely	No	No	No	Yes

As adverbs, super and extremely are synonyms defined as:

Other synonyms of super include deathly, exceedingly.

super (noun)	extremely (noun)
a caretaker for an apartment house; represents the owner as janitor and rent collector

super (adjective)	extremely (adjective)
including more than a specified category
extremely large
of the highest quality

super (adverb)	extremely (adverb)
to an extreme degree	to an extreme degree
	to a high degree or extent; favorably or with much respect