jug vs whiskey jug

jug and whiskey jug both are nouns.

Word	Noun	Adjective	Verb	Adverb
jug	Yes	No	Yes	No
whiskey jug	Yes	No	No	No

As nouns, whiskey jug is a hyponym of jug; that is, whiskey jug is a word with a more specific, narrower meaning than jug:

Other hyponyms of jug include bellarmine, greybeard, long-beard, longbeard, water jug.

jug (noun)	whiskey jug (noun)
a large bottle with a narrow mouth	a jug that contains whiskey
the quantity contained in a jug

jug (verb)	whiskey jug (verb)
stew in an earthenware jug
lock up or confine, in or as in a jail