testify vs adduce

testify and adduce both are verbs.

Word	Noun	Adjective	Verb	Adverb
testify	No	No	Yes	No
adduce	No	No	Yes	No

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

Other hyponyms of testify include attest, certify, demonstrate, evidence, manifest, presume, abduce, cite.

testify (verb)	adduce (verb)
give testimony in a court of law	advance evidence for
provide evidence for