amplification vs expanding upon

amplification and expanding upon both are nouns.

Word	Noun	Adjective	Verb	Adverb
amplification	Yes	No	No	No
expanding upon	Yes	No	No	No

As nouns, expanding upon is a hypernym of amplification; that is, expanding upon is a word with a broader meaning than amplification:

amplification: addition of extra material or illustration or clarifying detail
expanding upon: adding information or detail

Other hypernyms of amplification include expansion.

amplification (noun)	expanding upon (noun)
(electronics) the act of increasing voltage or power or current	adding information or detail
addition of extra material or illustration or clarifying detail
the amount of increase in signal power or voltage or current expressed as the ratio of output to input