double up vs gage

double up is not a noun while gage is a noun.

Word	Noun	Adjective	Verb	Adverb
double up	No	No	Yes	No
gage	Yes	No	Yes	No

As verbs, gage is a hypernym of double up; that is, gage is a word with a broader meaning than double up:

Other hypernyms of double up include back, bet on, game, punt, stake.

double up (noun)	gage (noun)
	a measuring instrument for measuring and indicating a quantity such as the thickness of wire or the amount of rain etc.
	street names for marijuana

double up (verb)	gage (verb)
stake winnings from one bet on a subsequent wager	place a bet on
bend over or curl up, usually with laughter or pain
share a room or a bed designed for only one person