As a verb protect

is to keep safe; to defend; to guard; to prevent harm coming to.

As a noun sunhat is

a hat to protect from the sun.

As nouns the difference between sun and sunhat

is that sun is a star, especially when seen as the centre of any single solar system while sunhat is a hat to protect from the sun.

As a proper noun sun

is the star that the Earth revolves around and from which it receives light and warmth.

As a verb sun

is to expose to the warmth and radiation of the sun.

Sith is an alternative form of sidth.

As nouns the difference between sith and sidth

is that sith is fairy while sidth is (dialectal) depth or length, especially used of things hanging low, draping, or trailing.

As nouns the difference between length and sidth

is that length is the distance measured along the longest dimension of an object while sidth is (dialectal) depth or length, especially used of things hanging low, draping, or trailing.

As a verb length

is (obsolete) to lengthen.

Sugariness is a antonym of sourness.

As nouns the difference between sourness and sugariness

is that sourness is the quality or condition of being sour, usually said of human personalities while sugariness is the property of being sugary or sweet.

Bitterness is an antonym of sugariness.

As nouns the difference between bitterness and sugariness

is that bitterness is the quality of having a bitter taste while sugariness is the property of being sugary or sweet.

As nouns the difference between drop and sweatdrop

is that drop is a small mass of liquid just large enough to hold its own weight via surface tension, usually one that falls from a source of liquid while sweatdrop is a drop of sweat.

As verbs the difference between drop and sweatdrop

is that drop is to fall in droplets (of a liquid) while sweatdrop is to show a stylized bead of sweat at the forehead, indicating embarrassment, exasperation, etc.

As nouns the difference between sweat and sweatdrop

is that sweat is fluid that exits the body through pores in the skin usually due to physical stress and/or high temperature for the purpose of regulating body temperature and removing certain compounds from the circulation while sweatdrop is a drop of sweat.

As verbs the difference between sweat and sweatdrop

is that sweat is to emit sweat while sweatdrop is (of a character in anime or manga) to show a stylized bead of sweat at the forehead, indicating embarrassment, exasperation, etc.

As nouns the difference between anime and sweatdrop

is that anime is an alternative spelling of lang=en while sweatdrop is a drop of sweat.

As a verb sweatdrop is

to show a stylized bead of sweat at the forehead, indicating embarrassment, exasperation, etc.

As nouns the difference between manga and sweatdrop

is that manga is manga, a comic made in japanese style while sweatdrop is a drop of sweat.

As a verb sweatdrop is

(of a character in anime or manga) to show a stylized bead of sweat at the forehead, indicating embarrassment, exasperation, etc.