departure vs inflection

departure and inflection both are nouns.

Word	Noun	Adjective	Verb	Adverb
departure	Yes	No	No	No
inflection	Yes	No	No	No

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

Other hyponyms of departure include discrepancy, variance, variant, driftage, flection, flexion.

departure (noun)	inflection (noun)
the act of departing	the patterns of stress and intonation in a language
euphemistic expressions for death	a manner of speaking in which the loudness or pitch or tone of the voice is modified
a variation that deviates from the standard or norm	deviation from a straight or normal course
	a change in the form of a word (usually by adding a suffix) to indicate a change in its grammatical function