undershell

As a noun undershell

is the plastron of a turtle or tortoise.

As a verb undersell is

to sell goods for a lower price than a competitor.

As nouns the difference between undershell and underswell

is that undershell is the plastron of a turtle or tortoise while underswell is an undercurrent.

As nouns the difference between tortoise and undershell

is that tortoise is any of various land-dwelling reptiles, of family testudinidae , whose body is enclosed in a shell (carapace plus plastron) the animal can withdraw its head and four legs partially into the shell, providing some protection from predators while undershell is the plastron of a turtle or tortoise.

As a proper noun turtle

is a river in saskatchewan, canada.

As a noun undershell is

the plastron of a turtle or tortoise.

As nouns the difference between plastron and undershell

is that plastron is plastron while undershell is the plastron of a turtle or tortoise.