10-Letter Words Starting OP & Ending S

• incomprehensibility resulting from obscurity of meaning

• the quality of being opaque to a degree; the degree to which something reduces the passage of light

• a hard flap serving as a cover for (a) the gill slits in fishes or (b) the opening of the shell in certain gastropods when the body is retracted

• An echinoderm of the class Ophiuroidea; the brittlestar.

• being in force or having or exerting force

• relating to or requiring or amenable to treatment by surgery especially as opposed to medicine

• a person secretly employed in espionage for a government

• someone who can be employed as a detective to collect information and assist in criminal investigations

• effective; producing a desired effect

• (of e.g. a machine) performing or capable of performing