Flagellated protozoan and Protozoan

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

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

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

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