Difference between Sweetness and Pleasantness

SWEETNESS vs PLEASANTNESS: NOUN

The property of tasting as if it contains sugar
A pleasant disposition; kindness.
The condition of being sweet or sugary.
The quality or state of being sweet (in any sense of the adjective); gratefulness to the taste or to the smell; agreeableness.
The quality of being sweet, in any sense.
A pleasingly sweet olfactory property
The taste experience when sugar dissolves in the mouth
The quality of giving pleasure
The property of containing sugar

Something pleasant.
The state or quality of being pleasant.
Jocularity; pleasantry.
Vivacity; gaiety.
Pleasing or agreeable character or quality; the quality of being pleasing or of affording pleasure.
The feeling caused by agreeable stimuli; one pole of a continuum of states of feeling
The quality of giving pleasure

Sweetie, Softness, Kindness, Sugar, Honey, Delicacy, Smoothness, Charm, Gentleness, Tenderness, Sugariness, Bouquet, Fragrance, Pleasantness, Redolence

Quietness, Heartiness, Sociability, Attentiveness, Respectfulness, Coolness, Cheerfulness, Tidiness, Helpfulness, Peacefulness, Contentment, Agreeableness, Friendliness, Unpleasantness, Sweetness

Candy, Cute, Sweetie, Softness, Kindness, Sugar, Honey, Delicacy, Smoothness, Charm, Gentleness, Tenderness, Sugariness, Fragrance, Redolence

Loveliness, Politeness, Restfulness, Courteousness, Easiness, Heartiness, Sociability, Coolness, Tidiness, Peacefulness, Contentment, Agreeableness, Friendliness, Unpleasantness, Sweetness

It is a mark of chasm and sweetness.
Its strange sweetness threw me off a bit.
Mix ingredients until well combined and desired sweetness!
Honey is to be a symbol for sweetness.
Can a wine exhibit sweetness without being sugary?
The family is indeed showing their sweetness together.
Chili sauce has an inherent sweetness to it.
Badsberg Red Muscadel 2011: The raisin-like sweetness softens and rounds out the cheese's tanginess, adding a coating of honey-like sweetness.
You are the sweetness that breathes love into my heart and my tongue shows forth the fruit of your sweetness.
This specificity to sweetness but not saltiness also points to the stimulation of reward pathways associated with sweetness.

Pleasantness or unpleasantness, according to Wundt, is only one aspect of affect.
All I can see ahead of me is unpleasantness rather than pleasantness.
It provides energies conducive to pleasantness, charm, kindliness, and favorable outcomes.
Naphtali is a hind sent forth: he giveth sayings of pleasantness.
Individual variability of pleasantness ratings to stroking touch over different velocities.
His jovial smile and pleasantness for all made the day.
The degree of pleasantness versus unpleasantness exhibited in interpersonal relations.
And our brain misattributes that pleasantness to the context.
The pleasantness of visual symmetry: Always, never or sometimes.
The pleasantness, benefits and enjoyableness of an environment.