Flagellated protozoan and Protozoon

Flagellated protozoan noun - A usually nonphotosynthetic free-living protozoan with whiplike appendages; some are pathogens of humans and other animals.

Protozoon and flagellated protozoan are semantically related. In some cases you can use "Protozoon" instead a noun phrase "Flagellated protozoan".

Protozoon noun - Any of diverse minute acellular or unicellular organisms usually nonphotosynthetic.

Flagellated protozoan and protozoon are semantically related. Sometimes you can replace phrase "Flagellated protozoan" with "Protozoon", this terms are similar.