gauge vs underestimate

gauge and underestimate both are nouns.

Word	Noun	Adjective	Verb	Adverb
gauge	Yes	No	Yes	No
underestimate	Yes	No	Yes	No

As verbs, underestimate is a hyponym of gauge; that is, underestimate is a word with a more specific, narrower meaning than gauge:

Other hyponyms of gauge include quantise, quantize, misgauge, place, put, set, give, lowball, assess, make, count, reckon, truncate, guesstimate.

gauge (noun)	underestimate (noun)
a measuring instrument for measuring and indicating a quantity such as the thickness of wire or the amount of rain etc.	an estimation that is too low; an estimate that is less than the true or actual value
the distance between the rails of a railway or between the wheels of a train
the thickness of wire
diameter of a tube or gun barrel
accepted or approved instance or example of a quantity or quality against which others are judged or measured or compared

gauge (verb)	underestimate (verb)
measure precisely and against a standard	make a deliberately low estimate
adapt to a specified measurement	make too low an estimate of
mix in specific proportions	assign too low a value to
judge tentatively or form an estimate of (quantities or time)
determine the capacity, volume, or contents of by measurement and calculation
rub to a uniform size