solum

As a noun solum

is within a soil profile, a set of related soil horizons that share the same cycle of pedogenic processes.

As an adjective somber is

dark or dreary in character; joyless, and grim.

As a verb somber is

.

As nouns the difference between solum and topsoil

is that solum is within a soil profile, a set of related soil horizons that share the same cycle of pedogenic processes while topsoil is the most fertile soil, easiest to start new plants in.

Soilprofile is likely misspelled.

Soilprofile has no English definition.

As a noun solum

is within a soil profile, a set of related soil horizons that share the same cycle of pedogenic processes.

As nouns the difference between soum and solum

is that soum is while solum is within a soil profile, a set of related soil horizons that share the same cycle of pedogenic processes.

As nouns the difference between solum and slum

is that solum is within a soil profile, a set of related soil horizons that share the same cycle of pedogenic processes while slum is a dilapidated neighborhood where many people live in a state of poverty.

As a verb slum is

to visit a neighborhood of a status below one's own.

As nouns the difference between regolith and solum

is that regolith is the layer of loose rock, dust, sand, and soil, resting on the bedrock, that constitutes the surface layer of most dry land on earth, the moon, and other large solid aggregated celestial objects. There can also be sub-marine regolith. while solum is within a soil profile, a set of related soil horizons that share the same cycle of pedogenic processes.