colourise vs streak

colourise is not a noun while streak is a noun.

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

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

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

colourise (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

colourise (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