Ascaridia galli vs nematode

Ascaridia galli and nematode both are nouns.

Word	Noun	Adjective	Verb	Adverb
Ascaridia galli	Yes	No	No	No
nematode	Yes	No	No	No

As nouns, nematode is a hypernym of Ascaridia galli; that is, nematode is a word with a broader meaning than Ascaridia galli:

Ascaridia galli: intestinal parasite of domestic fowl
nematode: unsegmented worms with elongated rounded body pointed at both ends; mostly free-living but some are parasitic

Other hypernyms of Ascaridia galli include nematode worm, roundworm.

Ascaridia galli (noun)	nematode (noun)
intestinal parasite of domestic fowl	unsegmented worms with elongated rounded body pointed at both ends; mostly free-living but some are parasitic