symphilid vs arthropod

symphilid and arthropod both are nouns.

Word	Noun	Adjective	Verb	Adverb
symphilid	Yes	No	No	No
arthropod	Yes	No	No	No

As nouns, arthropod is a hypernym of symphilid; that is, arthropod is a word with a broader meaning than symphilid:

symphilid: minute arthropod often infesting the underground parts of truck-garden and greenhouse crops
arthropod: invertebrate having jointed limbs and a segmented body with an exoskeleton made of chitin

symphilid (noun)	arthropod (noun)
minute arthropod often infesting the underground parts of truck-garden and greenhouse crops	invertebrate having jointed limbs and a segmented body with an exoskeleton made of chitin