As a noun scum

is (uncountable) a layer of impurities that accumulates at the surface of a liquid (especially molten metal or water).

As a verb scum

is to remove the layer of scum from (a liquid etc).

As an adjective scumless is

free of scum.

As adjectives the difference between ethnocentric and nonethnocentric

is that ethnocentric is of or pertaining to ethnocentrism while nonethnocentric is not ethnocentric.

As adjectives the difference between sulfonated and polysulfonated

is that sulfonated is treated or reacted with a sulfonic acid while polysulfonated is sulfonated with many sulfonate groups.

As a verb sulfonated

is past tense of sulfonate.

As a noun sulfonate

is .

As an adjective polysulfonated is

sulfonated with many sulfonate groups.

As adjectives the difference between honey and mellitic

is that honey is describing a thing involving or resembling honey while mellitic is of or pertaining to honey or sugar.

As a noun honey

is a viscous, sweet fluid produced from plant nectar by bees. Often used to sweeten tea or to spread on baked goods.

As a verb honey

is to be gentle, agreeable, or coaxing; to talk fondly; to use endearments.

As a noun sugar

is sucrose in the form of small crystals, obtained from sugar cane or sugar beet and used to sweeten food and drink.

As a verb sugar

is to add sugar to; to sweeten with sugar.

As an interjection sugar

is used in place of shit.

As an adjective mellitic is

of or pertaining to honey or sugar.

As a noun mellite

is an mineral that is the aluminium salt of mellitic acid; honeystone.

As an adjective mellitic is

of or pertaining to honey or sugar.

In organic chemistry terms the difference between radical and phenylthiolate

is that radical is a free radical while phenylthiolate is the univalent radical C₆H₅-S- or anion C₆H₅-S^- derived from phenylthiol‎.

As nouns the difference between radical and phenylthiolate

is that radical is a member of the most progressive wing of the Liberal Party; someone favouring social reform (but generally stopping short of socialism) while phenylthiolate is the univalent radical C₆H₅-S- or anion C₆H₅-S^- derived from phenylthiol‎.

As an adjective radical

is favoring fundamental change, or change at the root cause of a matter.

As nouns the difference between anion and phenylthiolate

is that anion is a negatively charged ion while phenylthiolate is the univalent radical C₆H₅-S- or anion C₆H₅-S^- derived from phenylthiol‎.

As nouns the difference between dinitrile and phthalonitrile

is that dinitrile is any organic compound having two nitrile groups while phthalonitrile is any dinitrile derived from a phthalic acid.