tetranychid vs spider mite

tetranychid and spider mite both are nouns.

Word	Noun	Adjective	Verb	Adverb
tetranychid	Yes	No	No	No
spider mite	Yes	No	No	No

As nouns, tetranychid and spider mite are synonyms defined as:

tetranychid and spider mite: web-spinning mite that attacks garden plants and fruit trees

tetranychid (noun)	spider mite (noun)
web-spinning mite that attacks garden plants and fruit trees	web-spinning mite that attacks garden plants and fruit trees