stain vs spot

stain and spot both are nouns.

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

As nouns, stain and spot are synonyms defined as:

Other synonyms of stain include blot, smear, smirch.

As verbs, spot is a hypernym of stain; that is, spot is a word with a broader meaning than stain:

stain: make dirty or spotty, as by exposure to air; also used metaphorically
spot: make a spot or mark onto

Other hypernyms of stain include blob, blot, fleck.

stain (noun)	spot (noun)
an act that brings discredit to the person who does it	an act that brings discredit to the person who does it
a soiled or discolored appearance	a business establishment for entertainment
a symbol of disgrace or infamy	a lamp that produces a strong beam of light to illuminate a restricted area; used to focus attention of a stage performer
anything regarded as making something unclean	a playing card with a specified number of pips on it to indicate its value
(microscopy) a dye or other coloring material that is used in microscopy to make structures visible	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

stain (verb)	spot (verb)
produce or leave stains	mark with a spot or spots so as to allow easy recognition
color with a liquid dye or tint	become spotted
color for microscopic study	make a spot or mark onto
make dirty or spotty, as by exposure to air; also used metaphorically	mar or impair with a flaw
	catch sight of
	detect with the senses