sour vs soured

sour is a noun but soured is not a noun.

Word	Noun	Adjective	Verb	Adverb
sour	Yes	Yes	Yes	No
soured	No	Yes	No	No

sour (noun)	soured (noun)
the property of being acidic
the taste experience when vinegar or lemon juice is taken into the mouth
a cocktail made of a liquor (especially whiskey or gin) mixed with lemon or lime juice and sugar

sour (adjective)	soured (adjective)
having a sharp biting taste	having turned bad
showing a brooding ill humor
inaccurate in pitch
smelling of fermentation or staleness
in an unpalatable state
one of the four basic taste sensations; like the taste of vinegar or lemons

sour (verb)	soured (verb)
go sour or spoil
make sour or more sour