The difference between Notepad and Pad

Notepad as a noun:

A pad of paper, often bound, in which one jots down notes; a notebook.

Pad as a noun:

A flattened mass of anything soft, to sit or lie on.

Pad as a noun:

A cushion used as a saddle without a tree or frame.

Pad as a noun:

A soft, or small, cushion.

Pad as a noun:

A cushion-like thickening of the skin on the under side of the toes of animals.

Pad as a noun:

The mostly hairless flesh located on the bottom of an animal's foot or paw.

Pad as a noun:

Any cushion-like part of the human body, especially the ends of the fingers.

Pad as a noun:

A stuffed guard or protection, especially one worn on the legs of horses to prevent bruising.

Pad as a noun:

A soft bag or cushion to relieve pressure, support a part, etc.

Pad as a noun:

A sanitary napkin.

Pad as a noun (US):

A floating leaf of a water lily or similar plant.

Pad as a noun (cricket):

A soft cover for a batsman's leg that protects it from damage when hit by the ball.

Pad as a noun:

A kind of cushion for writing upon, or for blotting, especially one formed of many flat sheets of writing paper; now especially such a block of paper sheets as used to write on.

Pad as a noun:

A panel or strip of material designed to be sensitive to pressure or touch.

Pad as a noun:

A keypad.

Pad as a noun:

A flat surface or area from which a helicopter or other aircraft may land or be launched.

Pad as a noun:

An electrical extension cord with a multi-port socket one end: "trip cord"

Pad as a noun:

The effect produced by sustained lower reed notes in a musical piece, most common in blues music.

Pad as a noun:

A synthesizer instrument sound used for sustained background sounds.

Pad as a noun (US, slang):

A bed.

Pad as a noun (colloquial):

A small house, apartment, or mobile home occupied by a single person; such as a bachelor, playboy, etc.

Pad as a noun (UK, slang):

A prison cell.

Pad as a noun (cryptography):

A random key (originally written on a disposable pad) of the same length as the plaintext.

Pad as a noun:

A mousepad.

Pad as a noun (electronics):

The amount by which a signal has been reduced.

Pad as a noun (nautical):

A piece of timber fixed on a beam to fit the curve of the deck.

Pad as a verb (transitive):

To stuff.

Pad as a verb (transitive):

To furnish with a pad or padding.

Pad as a verb (transitive):

To fill or lengthen (a story, one's importance, etc.).

Pad as a verb (transitive):

To imbue uniformly with a mordant.

Pad as a verb (transitive, cricket):

To deliberately play the ball with the leg pad instead of the bat.

Pad as a noun (British, dialectal):

A toad.

Pad as a noun (British, dialectal, Australia, Ireland):

A footpath, particularly one unformed or unmaintained; a road or track. See footpad.

Pad as a noun:

An easy-paced horse; a padnag.

Pad as a noun (British, obsolete):

A robber that infests the road on foot; a highwayman or footpad.

Pad as a noun:

The act of highway robbery.

Pad as a noun (British, dialectal):

A type of wickerwork basket, especially as used as a measure of fish or other goods.

Pad as a verb (transitive):

To travel along (a road, path etc.).

Pad as a verb (intransitive):

To travel on foot.

Pad as a verb (intransitive):

To wear a path by walking.

Pad as a verb (intransitive):

To walk softly, quietly or steadily, especially without shoes.

Pad as a verb (intransitive, obsolete):

To practise highway robbery.

Pad as a noun:

The sound of soft footsteps, or a similar noise made by an animal etc.