sour

As an adverb stale

is always, all the time.

As an adjective sour is

having an acidic, sharp or tangy taste.

As a noun sour is

the sensation of a sour taste.

As a verb sour is

(label) to make sour.

As nouns the difference between sour and fragrance

is that sour is the sensation of a sour taste while fragrance is a pleasant smell or odour.

As an adjective sour

is having an acidic, sharp or tangy taste.

As a verb sour

is (label) to make sour.

As nouns the difference between fly and sour

is that fly is (zoology) any insect of the order diptera; characterized by having two wings, also called true flies or fly can be (obsolete) the action of flying; flight while sour is the sensation of a sour taste.

As verbs the difference between fly and sour

is that fly is to travel through the air, another gas or a vacuum, without being in contact with a grounded surface or fly can be (baseball) to hit a fly ball; to hit a fly ball that is caught for an out compare ground (verb) and line (verb) while sour is (label) to make sour.

As adjectives the difference between fly and sour

is that fly is (slang|dated) quick-witted, alert, mentally sharp, smart (in a mental sense) while sour is having an acidic, sharp or tangy taste.

As adjectives the difference between sour and tonic

is that sour is having an acidic, sharp or tangy taste while tonic is pertaining to tension, especially of muscles.

As nouns the difference between sour and tonic

is that sour is the sensation of a sour taste while tonic is a substance with medicinal properties intended to restore or invigorate.

As a verb sour

is to make sour.

As nouns the difference between pungency and sour

is that pungency is the state of being pungent while sour is the sensation of a sour taste.

As an adjective sour is

having an acidic, sharp or tangy taste.

As a verb sour is

(label) to make sour.

As nouns the difference between tang and sour

is that tang is pliers while sour is the sensation of a sour taste.

As an adjective sour is

having an acidic, sharp or tangy taste.

As a verb sour is

(label) to make sour.

As adjectives the difference between putrid and sour

is that putrid is rotting, rotten, being in a state of putrefaction while sour is having an acidic, sharp or tangy taste.

As a noun sour is

the sensation of a sour taste.

As a verb sour is

(label) to make sour.

As adjectives the difference between lemony and sour

is that lemony is being lemon-like, especially in terms of taste while sour is having an acidic, sharp or tangy taste.

As a noun sour is

the sensation of a sour taste.

As a verb sour is

(label) to make sour.

As nouns the difference between acerbity and sour

is that acerbity is sourness of taste, with bitterness and astringency, like that of unripe fruit while sour is the sensation of a sour taste.

As an adjective sour is

having an acidic, sharp or tangy taste.

As a verb sour is

(label) to make sour.

As adjectives the difference between scrub and sour

is that scrub is mean; dirty; contemptible; scrubby while sour is having an acidic, sharp or tangy taste.

As nouns the difference between scrub and sour

is that scrub is one who labors hard and lives meanly; a mean fellow or scrub can be an instance of scrubbing while sour is the sensation of a sour taste.

As verbs the difference between scrub and sour

is that scrub is to rub hard; to wash with rubbing; usually, to rub with a wet brush, or with something coarse or rough, for the purpose of cleaning or brightening; as, to scrub a floor, a doorplate while sour is (label) to make sour.