chigger vs harvest mite

chigger and harvest mite both are nouns.

Word	Noun	Adjective	Verb	Adverb
chigger	Yes	No	No	No
harvest mite	Yes	No	No	No

As nouns, chigger and harvest mite are synonyms defined as:

chigger and harvest mite: larval mite that sucks the blood of vertebrates including human beings causing intense irritation

Other synonyms of chigger include jigger, redbug.

chigger (noun)	harvest mite (noun)
larval mite that sucks the blood of vertebrates including human beings causing intense irritation	larval mite that sucks the blood of vertebrates including human beings causing intense irritation
small tropical flea; the fertile female burrows under the skin of the host including humans