What are some words that become a new base word when they become plural nouns?

Examples of nouns that change meaning when plural are:

accommodation: an uncountable noun as a Word for a change in behavior or attitude that helps people work together or end a disagreement; the automatic adjustment of the eye for seeing at different distances.

accommodations: a Word for lodging and meals or traveling space and related services.

due: a right, what is owed.

dues: money paid regularly for membership in, for example, an organization or union.

dynamic: a Word for a force that stimulates change or progress within a system or process.

dynamics: a Word for the scientific study of movement.

effect (effects): is an abstract noun, a Word for a condition, or state of affairs that is produced by a cause; the condition of being in full force.

effects: another definition for the plural is a concrete noun, a Word for the things that belong to someone; artificial images and sounds created for film; an artificial appearance given to a surface or to an object.

future: an uncountable noun as a Word for the time that follows the present time; events that have not yet taken place.

futures: a countable noun as a Word for contracts to buy or sell shares, goods, or currency at an agreed price to be delivered at a time in the future.

good: abstract noun; a Word for something conforming to a moral order; praiseworthy character; something beneficial or useful.

goods: concrete noun; a Word for something having value; something produced for purchase.

notion: an abstract noun; a Word for a conception of or belief about something; a sudden wish or desire.

notions: a concrete noun; a Word for small useful articles (as pins, needles, or thread).

water: an uncountable noun for a clear, colorless, odorless, and tasteless liquid, H2O, essential for most plant and animal life.

waters: the plural form 'waters' is a Word for an area of seawater bordering on and under the control of a country (territorial waters); water from a particular source (the waters at Baden-Baden); or used for a particular type of situation (troubled waters).