difference vs flexion

difference and flexion both are nouns.

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

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

Other hyponyms of difference include discrepancy, variance, variant, driftage, flection, inflection.

difference (noun)	flexion (noun)
the quality of being unlike or dissimilar	act of bending a joint; especially a joint between the bones of a limb so that the angle between them is decreased
a disagreement or argument about something important	deviation from a straight or normal course
a variation that deviates from the standard or norm	the state of being flexed (as of a joint)
the number that remains after subtraction; the number that when added to the subtrahend gives the minuend
a significant change