underestimate vs underrating

underestimate and underrating both are nouns.

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

As nouns, underestimate and underrating are synonyms defined as:

underestimate and underrating: an estimation that is too low; an estimate that is less than the true or actual value

Other synonyms of underestimate include underestimation, underreckoning.

underestimate (noun)	underrating (noun)
an estimation that is too low; an estimate that is less than the true or actual value	an estimation that is too low; an estimate that is less than the true or actual value

underestimate (verb)	underrating (verb)
make a deliberately low estimate
make too low an estimate of
assign too low a value to