The difference between Biscuit and Spline

Biscuit as a noun (chiefly, UK, Australia, Ireland, NZ, rare in the US):

A small, flat, baked good which is either hard and crisp or else soft but firm: a cookie.

Biscuit as a noun (chiefly, North America):

A small, usually soft and flaky bread, generally made with baking soda, which is similar in texture to a scone but which is usually not sweet.

Biscuit as a noun (UK):

A cracker.

Biscuit as a noun (nautical):

The "bread" formerly supplied to naval ships, which was made with very little water, kneaded into flat cakes and slowly baked, and which often became infested with weevils.

Biscuit as a noun:

A form of unglazed earthenware.

Biscuit as a noun:

A light brown colour.

Biscuit as a noun (woodworking):

A thin oval wafer of wood or other material inserted into mating slots on pieces of material to be joined to provide gluing surface and strength in shear.

Biscuit as a noun (US, slang):

A plastic card bearing the codes for authorizing a nuclear attack.

Biscuit as a noun (US, slang, hiphop):

A handgun, especially a revolver.

Biscuit as a noun (ice hockey):

A hockey puck.

Spline as a noun:

Long thin piece of metal or wood.

Spline as a noun:

A rectangular piece that fits grooves like key seats in a hub and a shaft, so that while the one may slide endwise on the other, both must revolve together.

Spline as a noun:

A flexible strip of metal or other material, that may be bent into a curve and used in a similar manner to a ruler to draw smooth curves between points.

Spline as a noun (mathematics, computing):

Any of a number of smooth curves used to join points.

Spline as a noun (woodworking):

A strip of wood or other material inserted into grooves in each of two pieces of wood to provide additional surface for gluing.

Spline as a verb (mathematics, computing):

To smooth (a curve or surface) by means of a spline.

Spline as a verb (engineering):

To fit with a spline.

Spline as a verb (engineering):

To fasten to or together with a spline.