dirty vs spot

dirty is not a noun while spot is a noun.

Word	Noun	Adjective	Verb	Adverb
dirty	No	Yes	Yes	No
spot	Yes	No	Yes	No

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

Other hyponyms of dirty include foul, contaminate, foul, pollute, smear, slime, muddy, muddy up, splash, mire, muck, muck up, mud, crock, blemish.

dirty (noun)	spot (noun)
	an act that brings discredit to the person who does it
	a business establishment for entertainment
	a lamp that produces a strong beam of light to illuminate a restricted area; used to focus attention of a stage performer
	a playing card with a specified number of pips on it to indicate its value
	a blemish made by dirt
	a small contrasting part of something
	an outstanding characteristic
	a section of an entertainment that is assigned to a specific performer or performance
	a short section or illustration (as between radio or tv programs or in a magazine) that is often used for advertising
	a mark on a die or on a playing card (shape depending on the suit)
	a point located with respect to surface features of some region
	a small piece or quantity of something
	a slight attack of illness

dirty (adjective)	spot (adjective)
soiled or likely to soil with dirt or grime
(of behavior or especially language) characterized by obscenity or indecency
spreading pollution or contamination; especially radioactive contamination
unethical or dishonest
expressing or revealing hostility or dislike
obtained illegally or by improper means
(of a manuscript) defaced with changes
(of color) discolored by impurities; not bright and clear
vile; despicable
contaminated with infecting organisms
unpleasantly stormy
violating accepted standards or rules

dirty (verb)	spot (verb)
make soiled, filthy, or dirty	mark with a spot or spots so as to allow easy recognition
	become spotted
	make a spot or mark onto
	mar or impair with a flaw
	catch sight of
	detect with the senses