jigger vs redbug

jigger and redbug both are nouns.

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

As nouns, jigger and redbug are synonyms defined as:

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

Other synonyms of jigger include chigger, harvest mite.

jigger (noun)	redbug (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
a small glass adequate to hold a single swallow of whiskey
any small mast on a sailing vessel; especially the mizzenmast of a yawl