jigger vs shot glass

jigger and shot glass both are nouns.

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

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

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

Other synonyms of jigger include pony.

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