colour in vs streak

colour in is not a noun while streak is a noun.

Word	Noun	Adjective	Verb	Adverb
colour in	No	No	Yes	No
streak	Yes	No	Yes	No

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

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

colour in (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

colour in (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