difference vs fluctuation

difference and fluctuation both are nouns.

Word	Noun	Adjective	Verb	Adverb
difference	Yes	No	No	No
fluctuation	Yes	No	No	No

As nouns, fluctuation is a hypernym of difference; that is, fluctuation is a word with a broader meaning than difference:

Other hypernyms of difference include variation.

difference (noun)	fluctuation (noun)
the quality of being unlike or dissimilar	the quality of being unsteady and subject to changes
a disagreement or argument about something important	an instance of change; the rate or magnitude of change
a variation that deviates from the standard or norm	a wave motion
the number that remains after subtraction; the number that when added to the subtrahend gives the minuend
a significant change