The difference between Closure and Thunk

Closure as a noun:

An event or occurrence that signifies an ending.

Closure as a noun:

A feeling of completeness; the experience of an emotional conclusion, usually to a difficult period.

Closure as a noun:

A device to facilitate temporary and repeatable opening and closing.

Closure as a noun (programming):

An abstraction that represents a function within an environment, a context consisting of the variables that are both bound at a particular time during the execution of the program and that are within the function's scope.

Closure as a noun (mathematics):

The smallest set that both includes a given subset and possesses some given property.

Closure as a noun (topology, of a set):

The smallest closed set which contains the given set.

Closure as a noun:

The act of shutting; a closing.

Closure as a noun:

That which closes or shuts; that by which separate parts are fastened or closed.

Closure as a noun (obsolete):

That which encloses or confines; an enclosure.

Closure as a noun:

A method of ending a parliamentary debate and securing an immediate vote upon a measure before a legislative body.

Thunk as a verb (humorous, nonstandard):

Thunk as a verb:

To strike against something, without breakage, making a "thunk" sound.

Thunk as a noun (computing, [[functional programming]]):

A delayed computation.

Thunk as a noun (computing):

In the Scheme programming language, a function or procedure taking no arguments.

Thunk as a noun (computing):

A mapping of machine data from one system-specific form to another, usually for compatibility reasons, such as from 16-bit addresses to 32-bit to allow a 16-bit program to run on a 32-bit operating system.

Thunk as a verb (computing, [[functional programming]], transitive):

To delay (a computation).

Thunk as a verb (computing, transitive):

To map (machine data) from one system-specific form to another.