shot glass vs jigger

shot glass and jigger both are nouns.

Word	Noun	Adjective	Verb	Adverb
shot glass	Yes	No	No	No
jigger	Yes	No	No	No

As nouns, shot glass and jigger are synonyms defined as:

shot glass and jigger: a small glass adequate to hold a single swallow of whiskey

Other synonyms of shot glass include pony.

shot glass (noun)	jigger (noun)
a small glass adequate to hold a single swallow of whiskey	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