difference vs collision

difference and collision both are nouns.

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

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

difference (noun)	collision (noun)
the quality of being unlike or dissimilar	a conflict of opposed ideas or attitudes or goals
a disagreement or argument about something important	an accident resulting from violent impact of a moving object
a variation that deviates from the standard or norm	(physics) a brief event in which two or more bodies come together
the number that remains after subtraction; the number that when added to the subtrahend gives the minuend
a significant change