colourize vs streak

colourize is not a noun while streak is a noun.

Word	Noun	Adjective	Verb	Adverb
colourize	No	No	Yes	No
streak	Yes	No	Yes	No

As verbs, streak is a hyponym of colourize; that is, streak is a word with a more specific, narrower meaning than colourize:

colourize: add color to
streak: mark with spots or blotches of different color or shades of color as if stained

colourize (noun)	streak (noun)
	a narrow marking of a different color or texture from the background
	a distinctive characteristic
	a sudden flash (as of lightning)
	an unbroken series of events

colourize (verb)	streak (verb)
add color to	mark with spots or blotches of different color or shades of color as if stained
	move quickly in a straight line
	run naked in a public place