streak vs streaky

streak is a noun but streaky is not a noun.

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

streak (noun)	streaky (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

streak (adjective)	streaky (adjective)
	marked with or as if with stripes or linear discolorations

streak (verb)	streaky (verb)
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