As an adjective public

is public.

As a noun antifluoridationist is

one who opposes the addition of fluoride to the public water supply.

As nouns the difference between water and antifluoridationist

is that water is (uncountable) a chemical, found at room temperature and pressure as a clear liquid, having the formula h₂o, required by all forms of life on earth while antifluoridationist is one who opposes the addition of fluoride to the public water supply.

As a verb water

is to pour water into the soil surrounding (plants).

As nouns the difference between supply and antifluoridationist

is that supply is (uncountable) the act of supplying while antifluoridationist is one who opposes the addition of fluoride to the public water supply.

As a verb supply

is to provide (something), to make (something) available for use.

As an adverb supply

is supplely: in a supple manner, with suppleness.

As an adjective unsunned is

not having been exposed to the sun.

As an adjective knowable

is capable of being known, understood or comprehended.

As an adverb knowably is

in a knowable way.

As an adjective secretory

is of, pertaining to, or used in secretion.

As a noun synaptobrevin is

(biology) a small integral membrane protein of secretory vesicles.

As nouns the difference between vesicle and synaptobrevin

is that vesicle is (cytology) a membrane-bound compartment found in a cell while synaptobrevin is (biology) a small integral membrane protein of secretory vesicles.

As an adjective unknowable

is not knowable.

As a noun unknowable

is something that cannot be known.

As an adverb unknowably is

in an unknowable way; ineffably.

As adverbs the difference between ineffably and unknowably

is that ineffably is intensifies an adjective to mean indescribably while unknowably is in an unknowable way; ineffably.

As an adjective arcane

is understood by only a few; obscure; requiring secret or mysterious knowledge.

As an adverb arcanely is

in an arcane way.