Phthirius pubis and Sucking louse

Phthirius pubis noun - A louse that infests the pubic region of the human body.

Sucking louse and Phthirius pubis are semantically related. In some cases you can use "Sucking louse" instead a noun phrase "Phthirius pubis".

Sucking louse noun - Wingless usually flattened bloodsucking insect parasitic on warm-blooded animals.

Phthirius pubis and sucking louse are semantically related. Sometimes you can replace phrase "Phthirius pubis" with "Sucking louse", this phrases are similar.