show vs attest

show is a noun but attest is not a noun.

Word	Noun	Adjective	Verb	Adverb
show	Yes	No	Yes	No
attest	No	No	Yes	No

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

show: provide evidence for
attest: provide evidence for; stand as proof of; show by one's behavior, attitude, or external attributes

Other hyponyms of show include certify, demonstrate, evidence, manifest, presume, abduce, adduce, cite.

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

Other hyponyms of show include surcharge.

show (noun)	attest (noun)
an act or social event involving a public performance or entertainment
pretending that something is the case in order to make a good impression
something intended to communicate a particular impression

show (verb)	attest (verb)
establish the validity of something, as by an example, explanation or experiment	authenticate, affirm to be true, genuine, or correct, as in an official capacity
provide evidence for	provide evidence for; stand as proof of; show by one's behavior, attitude, or external attributes
indicate a place, direction, person, or thing; either spatially or figuratively	give testimony in a court of law
give expression to	establish or verify the usage of
give evidence of, as of records
indicate a certain reading; of gauges and instruments
finish third or better in a horse or dog race
show in, or as in, a picture
take (someone) to their seats, as in theaters or auditoriums
make visible or noticeable
be or become visible or noticeable
give an exhibition of to an interested audience