numerate vs summate

numerate is an adjective but summate is not an adjective.

Word	Noun	Adjective	Verb	Adverb
numerate	No	Yes	Yes	No
summate	No	No	Yes	No

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

Other hyponyms of numerate include recount, miscount, census, add, add together, add up, sum, sum up, tally, tot, tot up, total, tote up.

numerate (adjective)	summate (adjective)
able to understand and use numbers

numerate (verb)	summate (verb)
read out loud as words written numbers	determine the sum of
determine the number or amount of	form or constitute a cumulative effect