redbug vs chigger

redbug and chigger both are nouns.

Word	Noun	Adjective	Verb	Adverb
redbug	Yes	No	No	No
chigger	Yes	No	No	No

As nouns, redbug and chigger are synonyms defined as:

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

Other synonyms of redbug include harvest mite, jigger.

redbug (noun)	chigger (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