different between harshness vs tartness

English

harsh +? -ness

harshness (countable and uncountable, plural harshnesses)

The quality of being harsh.
- She wakened in sharp panic, bewildered by the grotesquerie of some half-remembered dream in contrast with the harshness of inclement fact, drowsily realising that since she had fallen asleep it had come on to rain smartly out of a shrouded sky.

tart +? -ness

tartness (countable and uncountable, plural tartnesses)

The characteristic of being tart; sharpness of taste
Synonyms: sourness, bitterness

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