pohja.

bottom (lowest part of anything, such as a container, body of water or a hole)

bed (place, or flat surface or layer, on which something else rests or is laid)

basis, foundation

fundament (underlying basis or principle)

crust (outer layer composed of pastry; bread-like base of a pizza)

synonym of perä (“far end of something”)

background, backdrop (especially in relation to shapes that stand out of the background)

musta kuvio valkoisella pohjalla

layout (spatial arrangement of a building or flat)

template, layout (generic model or pattern from which other objects are based or derived, especially texts)

sähköpostipohja

north, northern, Arctic (sometimes capitalized)

Pohjantähti

Pohjanlahti

bottom, invert (base of a tunnel)

invert (lowest point in a pipe)

pohjan yläpinta

pohjan alapinta

ellipsis of aallonpohja (“trough (of a wave)”)