demersal

As a letter s

is the letter s with a.

As an adjective demersal is

(biology) that lives near the bottom of a body of water.

As adjectives the difference between demersal and benthopelagic

is that demersal is (biology) that lives near the bottom of a body of water while benthopelagic is both benthic and pelagic.

As adjectives the difference between demersal and undefined

is that demersal is (biology) that lives near the bottom of a body of water while undefined is lacking a definition or value.

As an adjective demersal is

(biology) that lives near the bottom of a body of water.

In biology terms the difference between pelagic and demersal

is that pelagic is living in the open sea rather than in coastal or inland waters while demersal is that lives near the bottom of a body of water.

Planktonic is an antonym of demersal.

As adjectives the difference between planktonic and demersal

is that planktonic is of or pertaining to plankton while demersal is (biology) that lives near the bottom of a body of water.

Demersal is a synonym of benthic.

As adjectives the difference between benthic and demersal

is that benthic is pertaining to the benthos; living on the seafloor, as opposed to floating in the ocean while demersal is that lives near the bottom of a body of water.