barchan

As a noun barchan

is an arc-shaped sand ridge comprised of well-sorted sand.

As an adjective crescentic is

growing, increasing, gaining size etc.

As nouns the difference between barchan and transverse

is that barchan is an arc-shaped sand ridge comprised of well-sorted sand while transverse is anything that is transverse or athwart.

As an adjective transverse is

situated or lying across; side to side, relative to some defined "forward" direction.

As a verb transverse is

to overturn; to change.

Banchan is likely misspelled.

Banchan has no English definition.

As a noun barchan is

an arc-shaped sand ridge comprised of well-sorted sand.