graduation vs blending

graduation and blending both are nouns.

Word	Noun	Adjective	Verb	Adverb
graduation	Yes	No	No	No
blending	Yes	No	No	No

As nouns, blending is a hyponym of graduation; that is, blending is a word with a more specific, narrower meaning than graduation:

graduation: the act of arranging in grades
blending: a gradation involving small or imperceptible differences between grades

Other hyponyms of graduation include shading.

graduation (noun)	blending (noun)
the act of arranging in grades	a gradation involving small or imperceptible differences between grades
the successful completion of a program of study	the act of blending components together thoroughly
a line (as on a vessel or ruler) that marks a measurement
an academic exercise in which diplomas are conferred