spot vs stain

spot and stain both are nouns.

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

As nouns, spot and stain are synonyms defined as:

Other synonyms of spot include blot, smear, smirch.

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

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

Other hyponyms of spot include splotch, defile, maculate, sully, tarnish, bespeckle, speckle, bespatter, spatter.

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

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