megalith

As nouns the difference between megalith and megahertz

is that megalith is a construction involving one or several roughly hewn stone slabs of great size while megahertz is a unit equal to one-million cycles per second.

As nouns the difference between cromlechs and megalith

is that cromlechs is plural of cromlech while megalith is a construction involving one or several roughly hewn stone slabs of great size.

As a noun megalith

is a construction involving one or several roughly hewn stone slabs of great size.

As an adjective populous is

having a large population.

As nouns the difference between megalith and populists

is that megalith is a construction involving one or several roughly hewn stone slabs of great size while populists is plural of populist.

As nouns the difference between lithosphere and megalith

is that lithosphere is the rigid, mechanically strong, outer layer of the Earth; divided into twelve major plates while megalith is a construction involving one or several roughly hewn stone slabs of great size.

Pounderous is likely misspelled.

Pounderous has no English definition.

As a noun megalith

is a construction involving one or several roughly hewn stone slabs of great size.

As a noun megalith

is a construction involving one or several roughly hewn stone slabs of great size.

As an adjective ponderous is

heavy, massive, weighty.